Message type: E = Error
Message class:  FKK_ID_JP - FICA Japan 
Message number: 045
Message text: When existing value is inserted in &1, do not enter value in &2
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The SAP error message FKK_ID_JP045 typically occurs in the context of the SAP Convergent Charging or SAP Contract Accounts Receivable and Payable (FI-CA) modules. This error message indicates that there is a conflict in the data entry where a value is being inserted into a field that already has an existing value, and the system is enforcing a rule that prevents this.
Cause: The error message "When existing value is inserted in &1, do not enter value in &2" suggests that: You are trying to enter a value in field &2 while there is already a value present in field &1. The system has a validation rule that requires either field &1 or field &2 to be filled, but not both at the same time.
Solution: To resolve this error, you can take the following steps: Check Field Values: Review the values in both fields (&1 and &2). Determine which field currently has a value and which
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