How To Fix FKKBIX2030 - Consumption item &1 is a duplicate according to check schema &2

FKKBIX2030 - Overview

• Message type: E = Error

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

• Message number: 030

• Message text: Consumption item &1 is a duplicate according to check schema &2

What causes this issue?

For the consumption item being transferred of business partner &v3& with
ID &v1&, an unreversed <DS:TX.FKKBIX_CIT>consumption item</> already
exists, which, according to the <DS:DE.CIT_DCFIELD_KK>comparison fields
</> entered in <DS:DE.CIT_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
rating by the <DS:DE.CIT_DCFUNCNAME_KK>function module</> entered on
schema &v2&.

System Response

The consumption 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.

FKKBIX2030 - Details

• The SAP error message FKKBIX2030 indicates that there is a duplicate consumption item in the system according to the specified check schema. This error typically occurs in the context of financial accounting, particularly when dealing with consumption items in the context of billing or invoicing.
  
  Cause:
  The error is triggered when the system detects that the consumption item (identified by &1) has already been recorded in the system according to the rules defined in the check schema (identified by &2). This can happen due to:
  
  Duplicate Entries: The same consumption item has been entered multiple times in the billing document or invoice.
  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, it may have resulted in duplicate entries that are not handled correctly.
  
  
  Solution:
  To resolve the FKKBIX2030 error,