Message type: E = Error
Message class:  SAFM_EOPO - Expenditure Order and Payment Order 
Message number: 136
Message text: Archive Invoice document before archiving the payment proposal.
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The SAP error message SAFM_EOPO136 indicates that there is an issue with archiving a payment proposal because the associated invoice document has not been archived yet. This error typically arises in the context of the archiving process within SAP, particularly when dealing with financial documents such as invoices and payment proposals.
Cause: The primary cause of this error is that the system requires the invoice document to be archived before the payment proposal can be archived. This is a part of the data management and compliance processes in SAP, ensuring that all related documents are handled in the correct order.
Solution: To resolve this error, you need to follow these steps: Identify the Invoice Document: Determine which invoice document is associated with the payment proposal that you are trying to archive. You can usually find this information in the payment proposal details. Archive the Invoice Document: Use the appropriate transaction code (such as SARA) to archive
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