diff --git a/src/webparts/ctFormsPortal/forms/ct/components/CtCreateForm.tsx b/src/webparts/ctFormsPortal/forms/ct/components/CtCreateForm.tsx
index 653a1df..d33f566 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/CtCreateForm.tsx
+++ b/src/webparts/ctFormsPortal/forms/ct/components/CtCreateForm.tsx
@@ -9,7 +9,7 @@ import { Step1PositionSelection } from './Step1PositionSelection/Step1PositionSe
 import { Step2CommercialOffers } from './Step2CommercialOffers/Step2CommercialOffers';
 import { Step3ComparisonTable } from './Step3ComparisonTable/Step3ComparisonTable';
 import { Step4Approval } from './Step4Approval/Step4Approval';
-import { buildColumnsFromSpOffers, buildSupplierColumnId, findColumnForRecord } from './utils/supplierColumns';
+import { buildColumnsFromSpOffers, buildSupplierColumnId, findColumnForRecord, findWinnerColumnId } from './utils/supplierColumns';
 import { buildOffersFromSpRecords } from './utils/spOffers';
 import { excludedItemsToFormData } from './utils/excludedColumns';
 import { isUserInApprovalChain } from './utils/approvalAccess';
@@ -184,18 +184,26 @@ const CtCreateForm: React.FC<ICtCreateFormProps> = ({ context, userDisplayName,
         }
       }
 
+      // Preserve session suppliers and offers — SP data may be incomplete or stale vs. unsaved edits.
+      // Only use SP-derived data when session has none, or in review mode (always fresh).
+      const suppliers = withNoOfferSuppliers(
+        formData.suppliers.length === 0 ? [...spSuppliers, ...excluded.suppliers] : formData.suppliers,
+        noOfferFromSp,
+      );
+      // Победитель обязателен для «Сохранить» на Шаге 3: без сессии берём его из шапки СТ, иначе
+      // в другом браузере пришлось бы выбирать заново.
+      const winnerColumnId = formData.recommendedSupplierId === undefined
+        ? findWinnerColumnId(suppliers, ct.winSupplierSpId)
+        : undefined;
+
       updateFormData({
         ct,
         approvalMatrix,
         // Preserve session selectedPositions — overwriting changes pos.id (Запросы ID → Позиции СТ ID),
         // which breaks edits keys built from buildOfferKey(sup.id, pos.id) in Step 3.
         ...(preferSp || formData.selectedPositions.length === 0 ? { selectedPositions: positions } : {}),
-        // Preserve session suppliers and offers — SP data may be incomplete or stale vs. unsaved edits.
-        // Only use SP-derived data when session has none, or in review mode (always fresh).
-        suppliers: withNoOfferSuppliers(
-          formData.suppliers.length === 0 ? [...spSuppliers, ...excluded.suppliers] : formData.suppliers,
-          noOfferFromSp,
-        ),
+        suppliers,
+        ...(winnerColumnId !== undefined ? { recommendedSupplierId: winnerColumnId } : {}),
         ...(preferSp || formData.offers.length === 0 ? { offers: [...offers, ...excluded.offers] } : {}),
         ...(formData.currencyRates.length === 0 && spCurrencyRates.length > 0 ? { currencyRates: spCurrencyRates } : {}),
         ...(uploadedKpFiles.length > 0 ? { uploadedKpFiles } : {}),
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/ComparisonMatrix.tsx b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/ComparisonMatrix.tsx
index 04743b7..16307ab 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/ComparisonMatrix.tsx
+++ b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/ComparisonMatrix.tsx
@@ -8,6 +8,7 @@ import { SUPPLIER_STATUS_OPTIONS, getSubCols, formatKzt } from './matrixHelpers'
 import { UseAdataCheckResult } from './useAdataCheck';
 import { AdataIndicator } from './AdataIndicator';
 import { ExcludeSupplierDialog } from './ExcludeSupplierDialog';
+import { toggleWinner } from './step3Validation';
 import styles from './Step3ComparisonTable.module.scss';
 
 const FIXED_COLS = 3; // Наименование / Ед. изм. / Кол-во
@@ -113,8 +114,9 @@ export function ComparisonMatrix({ matrix, currencyRates, isRestrictedView, adat
                           <>
                             <button
                               className={[styles.selectSupplierBtn, isSel ? styles.selectSupplierBtnActive : ''].filter(Boolean).join(' ')}
-                              onClick={() => setSelectedSupplierId(s.id)}
+                              onClick={() => setSelectedSupplierId(toggleWinner(selectedSupplierId, s.id))}
                               aria-pressed={isSel}
+                              title={isSel ? 'Снять выбор' : 'Выбрать победителем'}
                             >
                               {isSel ? 'Выбран' : 'Выбрать'}
                             </button>
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/Step3ComparisonTable.tsx b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/Step3ComparisonTable.tsx
index 8f0d4b1..fc9c0e3 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/Step3ComparisonTable.tsx
+++ b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/Step3ComparisonTable.tsx
@@ -56,7 +56,8 @@ export const Step3ComparisonTable: React.FC<Props> = ({
   const matrix = useStep3Matrix({ service, formData, isReadOnly: !canEdit, onSave, onNext, onStepComplete });
   const {
     isReadOnly, newSupplierName, newSupplierCurrency, setNewSupplierName, setNewSupplierCurrency,
-    handleAddSupplier, handleAddSupplierFromDatabase, translateUnits, setTranslateUnits, isSaving, saveError, setSaveError, handleSave,
+    handleAddSupplier, handleAddSupplierFromDatabase, translateUnits, setTranslateUnits, isSaving, saveError, setSaveError,
+    validateBeforeSave, handleSave,
     extraPositions, suppliersWithOffer, columnDisplayNames, allPositions, computedOffers, selectedSupplierId,
     excludedColumns, handleRestoreSupplier,
   } = matrix;
@@ -242,7 +243,12 @@ export const Step3ComparisonTable: React.FC<Props> = ({
           </Button>
           <Button
             variant="primary"
-            onClick={() => (!ai.aiComment && !ai.isAiLoading) ? ai.setShowAiPromptDialog(true) : handleSave()}
+            onClick={() => {
+              // Сначала проверка (победитель, километраж), потом предложение комментария ИИ.
+              if (!validateBeforeSave()) return;
+              if (!ai.aiComment && !ai.isAiLoading) ai.setShowAiPromptDialog(true);
+              else void handleSave();
+            }}
             disabled={isSaving || isReadOnly}
           >
             {isSaving ? (
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.test.ts b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.test.ts
new file mode 100644
index 0000000..0459e39
--- /dev/null
+++ b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.test.ts
@@ -0,0 +1,41 @@
+import { STEP3_SAVE_ERRORS, getStep3SaveError, toggleWinner } from './step3Validation';
+
+describe('toggleWinner', () => {
+  it('нажали «Выбрать» — поставщик выбран', () => {
+    expect(toggleWinner(undefined, '259_278')).toBe('259_278');
+  });
+
+  // Раньше повторное нажатие ничего не делало — снять выбор было нельзя.
+  it('повторное нажатие на «Выбран» снимает выбор', () => {
+    expect(toggleWinner('259_278', '259_278')).toBeUndefined();
+  });
+
+  it('нажали «Выбрать» у другого — выбор переходит к нему', () => {
+    expect(toggleWinner('259_278', '282_320')).toBe('282_320');
+  });
+});
+
+describe('getStep3SaveError', () => {
+  const compared = ['259_278', '282_320'];
+
+  it('победитель выбран — сохранять можно', () => {
+    expect(getStep3SaveError({ selectedSupplierId: '259_278', comparedColumnIds: compared, hasDeliveryWithoutKm: false }))
+      .toBeUndefined();
+  });
+
+  it('победитель не выбран — нельзя', () => {
+    expect(getStep3SaveError({ selectedSupplierId: undefined, comparedColumnIds: compared, hasDeliveryWithoutKm: false }))
+      .toBe(STEP3_SAVE_ERRORS.noWinner);
+  });
+
+  // Выбор из сессии мог остаться на поставщике, которого исключили или чей КП убрали.
+  it('выбран поставщик не из сравниваемых — как будто не выбран', () => {
+    expect(getStep3SaveError({ selectedSupplierId: '300_400', comparedColumnIds: compared, hasDeliveryWithoutKm: false }))
+      .toBe(STEP3_SAVE_ERRORS.noWinner);
+  });
+
+  it('логистика без километража — нельзя', () => {
+    expect(getStep3SaveError({ selectedSupplierId: '259_278', comparedColumnIds: compared, hasDeliveryWithoutKm: true }))
+      .toBe(STEP3_SAVE_ERRORS.deliveryKmMissing);
+  });
+});
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.ts b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.ts
new file mode 100644
index 0000000..e914c39
--- /dev/null
+++ b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/step3Validation.ts
@@ -0,0 +1,30 @@
+// Проверки перед «Сохранить и продолжить» на Шаге 3. Сообщения — для пользователя.
+
+export const STEP3_SAVE_ERRORS = {
+  noWinner: 'Выберите поставщика-победителя: кнопка «Выбрать» в шапке его колонки.',
+  deliveryKmMissing: 'Укажите километраж для каждого потенциального поставщика в строке логистики',
+};
+
+export interface Step3SaveCheckInput {
+  selectedSupplierId: string | undefined;
+  // Колонки, которые сравниваются (без исключённых).
+  comparedColumnIds: string[];
+  hasDeliveryWithoutKm: boolean;
+}
+
+// Победитель обязателен (решение от 2026-10-27): он уходит в шапку СТ (winSupplier) — без него
+// отчёт и согласование не знают, кого выбрали. Выбранный должен быть среди сравниваемых:
+// исключённый или удалённый поставщик победителем не считается.
+export function getStep3SaveError(input: Step3SaveCheckInput): string | undefined {
+  const { selectedSupplierId, comparedColumnIds, hasDeliveryWithoutKm } = input;
+  if (!selectedSupplierId || !comparedColumnIds.includes(selectedSupplierId)) {
+    return STEP3_SAVE_ERRORS.noWinner;
+  }
+  if (hasDeliveryWithoutKm) return STEP3_SAVE_ERRORS.deliveryKmMissing;
+  return undefined;
+}
+
+// Кнопка «Выбрать» / «Выбран»: повторное нажатие на выбранного снимает выбор.
+export function toggleWinner(currentId: string | undefined, clickedId: string): string | undefined {
+  return currentId === clickedId ? undefined : clickedId;
+}
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/useStep3Matrix.ts b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/useStep3Matrix.ts
index e14ba3e..0a21519 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/useStep3Matrix.ts
+++ b/src/webparts/ctFormsPortal/forms/ct/components/Step3ComparisonTable/useStep3Matrix.ts
@@ -7,6 +7,7 @@ import { ExtraSupplier, ExtraPosition, PositionRow, CellEdit, EditableOffers, Cr
 import { applyCreatedIds, buildOfferKey, computeColumnsOffers, sumPositionTotals } from './matrixHelpers';
 import { buildExcludedRecordsForSave } from '../utils/excludedColumns';
 import { parseNumberInput } from '../utils/parseNumberInput';
+import { getStep3SaveError } from './step3Validation';
 import { IVendorRecord } from '../../services/VendorDatabaseService';
 import { buildColumnDisplayNames, buildColumnLabels, findColumnForRecord } from '../utils/supplierColumns';
 import { getNoOfferSuppliers } from '../utils/noOfferSuppliers';
@@ -705,15 +706,23 @@ export function useStep3Matrix(args: UseStep3MatrixArgs) {
     onSave({ step3ExtraSuppliers: nextSuppliers, step3ExtraPositions: nextPositions });
   };
 
+  // Проверка перед «Сохранить и продолжить». Показывает ошибку и говорит, можно ли сохранять.
+  // Вызывается и до диалога «Комментарий от ИИ» — чтобы не гонять пользователя через ИИ к отказу.
+  const validateBeforeSave = (): boolean => {
+    const error = getStep3SaveError({
+      selectedSupplierId,
+      comparedColumnIds: suppliersWithOffer.map(s => s.id),
+      hasDeliveryWithoutKm: extraPositions.some(ep =>
+        ep.isDelivery && suppliersWithOffer.some(s => !deliveryKm[`${ep.id}::${s.id}`])
+      ),
+    });
+    setSaveError(error);
+    return error === undefined;
+  };
+
   const handleSave = async (): Promise<void> => {
     if (!ct) return;
-    const deliveryMissingKm = extraPositions.filter(ep =>
-      ep.isDelivery && suppliersWithOffer.some(s => !deliveryKm[`${ep.id}::${s.id}`])
-    );
-    if (deliveryMissingKm.length > 0) {
-      setSaveError('Укажите километраж для каждого потенциального поставщика в строке логистики');
-      return;
-    }
+    if (!validateBeforeSave()) return;
     setIsSaving(true);
     setSaveError(undefined);
 
@@ -980,6 +989,7 @@ export function useStep3Matrix(args: UseStep3MatrixArgs) {
     handleAddDelivery,
     handleDeliveryKmChange,
     handleDeleteExtraPosition,
+    validateBeforeSave,
     handleSave,
   };
 }
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/types/domain.ts b/src/webparts/ctFormsPortal/forms/ct/components/types/domain.ts
index 2f60f69..289c6af 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/types/domain.ts
+++ b/src/webparts/ctFormsPortal/forms/ct/components/types/domain.ts
@@ -48,6 +48,8 @@ export interface CT {
   // блока «Выгрузка в INCORE» и т.п.: в новом механизме согласования (approval-route API)
   // инициатор в саму матрицу согласования не входит, в отличие от прежней цепочки.
   authorEmail?: string;
+  // Победитель (лукап winSupplier → «Поставщики»), записывается на Шаге 3.
+  winSupplierSpId?: number;
 }
 
 export type CTStatus =
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.test.ts b/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.test.ts
index b89def1..8e23794 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.test.ts
+++ b/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.test.ts
@@ -1,6 +1,27 @@
-import { buildColumnDisplayNames, buildColumnLabels, buildColumnsFromSpOffers, buildSupplierColumnId, findColumnForRecord, findSiblingColumnIds } from './supplierColumns';
+import { buildColumnDisplayNames, buildColumnLabels, buildColumnsFromSpOffers, buildSupplierColumnId, findColumnForRecord, findSiblingColumnIds, findWinnerColumnId } from './supplierColumns';
 import { Supplier } from '../types/domain';
 
+describe('findWinnerColumnId (победитель из шапки СТ при открытии без сессии)', () => {
+  const columns: Supplier[] = [
+    { id: '281_318', spId: 281, kpFileSpId: 318, name: 'SteelGate', hasOffer: true, exclusion: { reason: 'Дорого' } },
+    { id: '281_330', spId: 281, kpFileSpId: 330, name: 'SteelGate', hasOffer: true },
+    { id: '282_320', spId: 282, kpFileSpId: 320, name: 'Каспий Дорс', hasOffer: true },
+  ];
+
+  it('колонка победителя по SP Id поставщика', () => {
+    expect(findWinnerColumnId(columns, 282)).toBe('282_320');
+  });
+
+  it('у поставщика с несколькими КП — первая неисключённая колонка', () => {
+    expect(findWinnerColumnId(columns, 281)).toBe('281_330');
+  });
+
+  it('победителя нет или его колонки нет — undefined', () => {
+    expect(findWinnerColumnId(columns, undefined)).toBeUndefined();
+    expect(findWinnerColumnId(columns, 999)).toBeUndefined();
+  });
+});
+
 describe('buildSupplierColumnId', () => {
   it('колонка = поставщик + файл КП', () => {
     expect(buildSupplierColumnId(263, 277)).toBe('263_277');
diff --git a/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.ts b/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.ts
index 37263e7..68afdbf 100644
--- a/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.ts
+++ b/src/webparts/ctFormsPortal/forms/ct/components/utils/supplierColumns.ts
@@ -44,6 +44,13 @@ export function buildColumnsFromSpOffers(records: SpOfferColumnSource[]): Suppli
   return Array.from(columnsById.values());
 }
 
+// Колонка победителя по winSupplier из шапки СТ (СТ открыта без сессии). В SP хранится поставщик,
+// а не колонка: у поставщика с несколькими КП берём первую неисключённую колонку.
+export function findWinnerColumnId(columns: Supplier[], winSupplierSpId: number | undefined): string | undefined {
+  if (winSupplierSpId === undefined) return undefined;
+  return columns.find(c => c.spId === winSupplierSpId && c.hasOffer !== false && !c.exclusion)?.id;
+}
+
 // Колонки той же компании (тот же SP Id поставщика), включая саму колонку. Нужно для данных, которые
 // принадлежат компании, а не КП: проверка Adata, БИН.
 export function findSiblingColumnIds(columns: Supplier[], columnId: string): string[] {
diff --git a/src/webparts/ctFormsPortal/forms/ct/services/CtService.ts b/src/webparts/ctFormsPortal/forms/ct/services/CtService.ts
index e0ecaec..68e900a 100644
--- a/src/webparts/ctFormsPortal/forms/ct/services/CtService.ts
+++ b/src/webparts/ctFormsPortal/forms/ct/services/CtService.ts
@@ -819,7 +819,7 @@ export class CtService {
   }
 
   async loadCTById(ctId: string): Promise<CT> {
-    const url = `${this._liById(LISTS.CT, ctId)}?$select=Id,Title,number,project,status,Author/EMail&$expand=Author`;
+    const url = `${this._liById(LISTS.CT, ctId)}?$select=Id,Title,number,project,status,winSupplierId,Author/EMail&$expand=Author`;
     const res = await this.http.get(url, SPHttpClient.configurations.v1);
     if (!res.ok) throw new Error(`Ошибка загрузки СТ: ${res.status}`);
     const data = await res.json();
@@ -829,6 +829,7 @@ export class CtService {
       projectName: String(data.project ?? ""),
       status: CHOICE_TO_CT_STATUS[String(data.status ?? "")] ?? "formed",
       authorEmail: String(data.Author?.EMail ?? "") || undefined,
+      winSupplierSpId: data.winSupplierId ? Number(data.winSupplierId) : undefined,
     };
   }