Message type: E = Error
Message class:  CNV_OT_APPL_PE - Messages for application specific functions 
Message number: 004
Message text: Posting simulation is successful (no errors occurred)
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message "CNV_OT_APPL_PE004 Posting simulation is successful (no errors occurred)" is not actually an error message in the traditional sense. Instead, it indicates that a posting simulation has been executed successfully without any errors. This message is typically part of the data migration process, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools.
Cause: The message is generated during a simulation run of a data migration or posting process. It indicates that the data being processed is valid and that the simulation has completed without any issues.
Solution: Since this message indicates success, there is no action required to resolve an error. However, if you are expecting an error or if you are unsure about the next steps after this message, consider the following: Review Simulation Results: Check the details of the simulation to ensure that the results align with your expectations. Proceed with Actual Posting: If the simulation was successful
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