diff --git a/CompanyManagment.App.Contracts/ContractingPartyBankAccounts/IContractingPartyBankAccountsApplication.cs b/CompanyManagment.App.Contracts/ContractingPartyBankAccounts/IContractingPartyBankAccountsApplication.cs
index f4864441..992e9808 100644
--- a/CompanyManagment.App.Contracts/ContractingPartyBankAccounts/IContractingPartyBankAccountsApplication.cs
+++ b/CompanyManagment.App.Contracts/ContractingPartyBankAccounts/IContractingPartyBankAccountsApplication.cs
@@ -90,7 +90,7 @@ public class InquiryContractingPartyBankDetailsRequest
     public string CardNumber { get; set; }
     public string AccountNumber { get; set; }
     public string IBan { get; set; }
-    public UidBanks UidBank { get; set; }
+    public UidBanks? UidBank { get; set; }
 }
 public class ContractingPartyBankInquiryResponse
 {
diff --git a/CompanyManagment.Application/ContractingPartyBankAccountsApplication.cs b/CompanyManagment.Application/ContractingPartyBankAccountsApplication.cs
index e1e1dc0a..c06e5729 100644
--- a/CompanyManagment.Application/ContractingPartyBankAccountsApplication.cs
+++ b/CompanyManagment.Application/ContractingPartyBankAccountsApplication.cs
@@ -193,7 +193,7 @@ public class ContractingPartyBankAccountsApplication : IContractingPartyBankAcco
         }
         else if (!string.IsNullOrWhiteSpace(accountNumber))
         {
-            var accountNumberRes = await _uidService.AccountToIban(accountNumber, uidBank);
+            var accountNumberRes = await _uidService.AccountToIban(accountNumber, uidBank.Value);
             if (accountNumberRes.ResponseContext.Status.Code != 0)
             {
                 throw new BadRequestException(