Message type: E = Error
Message class:  CNV_CMIS_A_20 - Message class for Cross-Client Customizing Comparison (SLO) 
Message number: 281
Message text: Subactivity & was completed on & at &:
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_CMIS_A_20281 typically relates to issues encountered during the execution of a conversion or migration activity in the context of SAP's Conversion and Migration tools, particularly in the context of the SAP S/4HANA migration process. This error message indicates that a specific subactivity was completed, but there may be issues or warnings associated with it.
Cause: Data Inconsistencies: The error may arise due to inconsistencies in the data being migrated or converted. This could be due to missing data, incorrect data formats, or violations of data integrity constraints.
Configuration Issues: There may be configuration settings that are not properly set up for the migration or conversion process. Technical Errors: There could be technical issues such as system performance problems, timeouts, or resource limitations during the execution of the subactivity. Dependencies: The subactivity may depend on the successful completion of previous activities, and if those were not completed successfully, it could lead to
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