Message type: E = Error
Message class:  VN - Nachrichtensteuerung 
Message number: 039
Message text: Output & for partner & already active for change
You tried to reactivate a changed output.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message VN039 - "Output & for partner & already active for change" typically occurs in the context of Vendor Master Data maintenance, specifically when dealing with output determination for vendor master changes. Meaning /
Cause: The message indicates that an output type (e.g., a printout, email, or EDI message) for a particular partner (vendor) is already active for change. In other words, you are trying to activate or create an output type for a vendor partner that is already active or in process for changes. This usually happens when the system detects that an output message is already scheduled or flagged for processing for the vendor, and you are attempting to create or activate a duplicate or conflicting output. When does it occur? During vendor master data change transactions (e.g., XK02, FK02). When configuring or triggering output messages for vendor master changes. When output determination is set up to send notifications or documents upon vendor
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