Message type: E = Error
Message class:  FKK_ID_XX_ODN - ODN message 
Message number: 089
Message text: Access sequence number &1 is already being used
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The SAP error message FKK_ID_XX_ODN089 indicates that there is an issue with the access sequence number in the context of contract accounts or billing documents in the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) module. The specific message states that the access sequence number you are trying to use is already in use, which typically means that there is a conflict or duplication in the configuration.
Cause: Duplicate Access Sequence: The access sequence number you are trying to create or modify is already assigned to another object or configuration in the system. Configuration Error: There may be an error in the configuration settings where the same access sequence is being referenced multiple times. Data Consistency Issues: There could be inconsistencies in the database or configuration tables that are causing the system to recognize the access sequence as already in use.
Solution: Check Existing Access Sequences: Go to the relevant configuration area in SAP
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