Message type: E = Error
Message class:  FKK_ID_XX_SAFT - SAFT message 
Message number: 048
Message text: Combination &1 is already used (first conflict only)
You have tried to create a new extraction rule using a combination of
document types, origin keys, and contract account category that already
exists for the selected posting period.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Either select a different combination of values for the posting period
or change the posting period.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FKK_ID_XX_SAFT048 indicates that there is a conflict with a combination of data that is already in use within the system. This error typically arises in the context of SAP Convergent Charging or SAP Contract Accounts Receivable and Payable (FI-CA) when trying to create or modify a record that conflicts with existing data.
Cause: The error message is triggered when you attempt to create or modify a record (such as a contract, invoice, or payment) that has a combination of fields (like account number, contract number, etc.) that already exists in the system. This could happen due to: Duplicate Entries: The combination of identifiers you are trying to use is already associated with another record. Data Integrity Rules: SAP has built-in rules to prevent data integrity issues, and this error is a safeguard against creating conflicting records. Incorrect Data Input: There may be a mistake in the data you are entering, leading
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