diff --git a/src/request-management/request-management.service.ts b/src/request-management/request-management.service.ts
index 64821e8..e17b350 100644
--- a/src/request-management/request-management.service.ts
+++ b/src/request-management/request-management.service.ts
@@ -110,6 +110,7 @@ import {
   collectUserIdVariants,
 } from "src/helpers/party-access-queries";
 import { resolveLinkedUserIdStrings } from "src/helpers/user-access-resolver";
+import { normalizePlateText } from "src/utils/plate-normalizer/plate-normalizer.service";
 
 /**
  * Formats a compact Jalali date (number or string like 13780624) as YYYY/MM/DD.
@@ -134,6 +135,34 @@ export class RequestManagementService {
     throw new BadRequestException(`Step ${stepKey} is not a party-scoped step`);
   }
 
+  /**
+   * Reverse map: Fanavaran/Tejarat numeric letter code → Persian plate letter.
+   * Tejarat inquiry stores Plk2 as a numeric code (e.g. 12 → "م", 5 → "د").
+   * ESG VIN inquiry via parsePlkString already returns the actual letter string,
+   * but the mock and some Tejarat responses use the numeric code form.
+   */
+  private static readonly PLATE_LETTER_CODE_TO_LETTER: Record<number, string> = {
+    1: "الف", 2: "ب", 3: "پ", 4: "ج", 5: "د",
+    6: "س", 7: "ص", 8: "ط", 9: "ع", 10: "ق",
+    11: "ل", 12: "م", 13: "ن", 14: "و", 15: "ه",
+    16: "ی", 17: "ک", 18: "ژ", 19: "ت", 20: "ث",
+    21: "ز", 22: "ش", 23: "ف", 24: "گ",
+  };
+
+  /**
+   * Resolve a plate center letter from whatever shape Plk2 arrives in:
+   * - already a Persian string → returned as-is (after normalization)
+   * - a numeric code (number or numeric string) → looked up in the reverse map
+   */
+  private resolvePlk2Letter(plk2: any): string {
+    if (plk2 == null) return "";
+    const code = Number(plk2);
+    if (Number.isFinite(code) && code > 0) {
+      return RequestManagementService.PLATE_LETTER_CODE_TO_LETTER[code] ?? "";
+    }
+    return normalizePlateText(String(plk2).trim());
+  }
+
   /** Convert plate (string or { ir, leftDigits, centerAlphabet, centerDigits }) to string for vehicle.plateId */
   private plateToPlateIdString(plate: any): string {
     if (plate == null) return "";
@@ -1842,12 +1871,16 @@ export class RequestManagementService {
 
       if (!party.vehicle) party.vehicle = {} as any;
       party.vehicle.isNew = body.isNewCar;
-      // Derive plateId from the plate parts returned by the VIN inquiry (plk → Plk1/Plk2/Plk3/PlkSrl).
+      // Derive plateId from the plate parts returned by the VIN inquiry.
+      // Plk2 may be a numeric letter code (e.g. 5 → "د") or already a Persian
+      // letter string — resolvePlk2Letter handles both forms.
       // Falls back to the submitted VIN so plateId is never empty.
       party.vehicle.plateId = this.plateToPlateIdString({
         ir: inquiryMapped?.PlkSrl,
         leftDigits: inquiryMapped?.Plk1,
-        centerAlphabet: inquiryMapped?.Plk2 ?? inquiryMapped?.plateLetterid,
+        centerAlphabet: this.resolvePlk2Letter(
+          inquiryMapped?.Plk2 ?? inquiryMapped?.plateLetterid,
+        ),
         centerDigits: inquiryMapped?.Plk3,
       }) || body.vin;
       party.vehicle.name = inquiryMapped?.MapTypNam;
@@ -9514,12 +9547,16 @@ export class RequestManagementService {
       (party.person as any).licenseType = (partyData as any).licenseType;
 
     if (!party.vehicle) party.vehicle = {} as any;
-    // Derive plateId from the plate parts returned by the VIN inquiry (plk → Plk1/Plk2/Plk3/PlkSrl).
+    // Derive plateId from the plate parts returned by the VIN inquiry.
+    // Plk2 may be a numeric letter code (e.g. 5 → "د") or already a Persian
+    // letter string — resolvePlk2Letter handles both forms.
     // Falls back to the submitted VIN so plateId is never empty.
     party.vehicle.plateId = this.plateToPlateIdString({
       ir: inquiryMapped?.PlkSrl,
       leftDigits: inquiryMapped?.Plk1,
-      centerAlphabet: inquiryMapped?.Plk2 ?? inquiryMapped?.plateLetterid,
+      centerAlphabet: this.resolvePlk2Letter(
+        inquiryMapped?.Plk2 ?? inquiryMapped?.plateLetterid,
+      ),
       centerDigits: inquiryMapped?.Plk3,
     }) || partyData.vin;
     party.vehicle.name = inquiryMapped?.MapTypNam;