Message type: E = Error
Message class:  FKKBIX_BIP -  
Message number: 153
Message text: Subseq. item creation not possible. Item &1 has already been completed.
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The SAP error message FKKBIX_BIP153 indicates that there is an issue with the creation of a subsequent item in a billing document or financial transaction. The specific message states that the item in question (denoted by &1) has already been completed, which means that it cannot be modified or have subsequent items created for it.
Cause: Item Status: The item referenced in the error message has already been processed or completed, which prevents any further modifications or the addition of subsequent items. Document Flow: The document may have already been finalized, and SAP does not allow changes to completed items to maintain data integrity. Business Logic: Certain business processes may dictate that once an item is completed, it cannot be altered or have new items added.
Solution: Check Item Status: Review the status of the item in question. If it is indeed completed, you will need to determine if you can create a new document or
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