Message type: E = Error
Message class:  OIJ_RU - Messages for TSW-ETRAN integration 
Message number: 600
Message text: SD invoice &1 &2 not posted to FI
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The SAP error message OIJ_RU600, which indicates that an SD invoice (Sales and Distribution invoice) has not been posted to Financial Accounting (FI), can arise from various causes. Here’s a breakdown of potential causes, solutions, and related information: Causes: Missing Configuration: The integration between SD and FI may not be properly configured. This can include missing account determination settings or incorrect settings in the billing document type. Document Status: The invoice may be in a status that prevents it from being posted to FI. For example, it might be in a "blocked" status or not fully processed. Posting Period Issues: The posting period for the invoice may be closed, preventing it from being posted to FI. Data Inconsistencies: There may be inconsistencies in the data that prevent the invoice from being processed correctly, such as missing or incorrect master data. Authorization Issues: The user attempting to post the invoice may not have the necessary authorizations to
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