Message type: E = Error
Message class:  FKKINV - Invoicing in Contract Accounts Receivable and Payable 
Message number: 690
Message text: No authorization to set a invoicing lock for &1.
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The SAP error message FKKINV690 indicates that a user does not have the necessary authorization to set an invoicing lock for a specific document or entity. This error typically occurs in the context of the SAP Convergent Charging or SAP Contract Accounts Receivable and Payable (FI-CA) modules, where invoicing processes are managed.
Cause: The primary cause of this error is a lack of appropriate authorization in the user's role or profile. The system checks the user's permissions when attempting to set an invoicing lock, and if the required authorization object is not included in the user's profile, the error is triggered.
Solution: To resolve this issue, you can take the following steps: Check User Authorizations: Use transaction code SU53 immediately after the error occurs to analyze the authorization check. This will show you which authorization object is missing. Alternatively, you can use transaction code SU01 to view the user's roles and authorizations. Review Authorization Objects: The relevant authorization object
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