How To Fix FKKBIX2013 - Item for source trans. &1 is a duplicate according to check schema &2

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKBIX2 - Billing in Contract Accounts Receivable and Payable

• Message number: 013

• Message text: Item for source trans. &1 is a duplicate according to check schema &2

What causes this issue?

For the item being transferred of business partner &v3& with source
transaction &v1&, an unreversed <DS:TX.FKKBIX_BIT>billable item</>
already exists, which, according to the <DS:DE.BIT_DCFIELD_KK>comparison
fields</> entered in <DS:DE.BIT_DCSCHEMA_KK>check schema</> &v2& for the
duplicate check, is identical with the item being transferred.
The item was transferred nonetheless, since the item was released for
billing by the <DS:DE.BIT_DCFUNCNAME_KK>function module</> entered on
schema &v2&.

System Response

The billable item was transferred.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKBIX2013 - Item for source trans. &1 is a duplicate according to check schema &2 ?

  The SAP error message FKKBIX2013 indicates that there is a duplicate item in the context of a source transaction, which is being checked against a specified check schema. This error typically arises during the processing of financial documents, particularly in the context of accounts payable or accounts receivable.
  
  Cause:
  The error occurs when the system detects that an item being processed (identified by the source transaction number) is already present in the system according to the rules defined in the check schema. This can happen due to:
  
  Duplicate Entries: The same item has been entered multiple times in the transaction.
  Incorrect Configuration: The check schema may be configured in a way that does not allow for certain duplicates, even if they are valid in other contexts.
  Data Migration Issues: If data has been migrated from another system, duplicates may have been inadvertently created.
  User Error: Users may have inadvertently entered the same transaction multiple times.
  
  
  Solution:
  To resolve