Message type: E = Error
Message class:  CNV20600 - message class for package 20600 
Message number: 008
Message text: For table &1 control table CNVSTEPS was modified (performance optimiz.)
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The SAP error message CNV20600008 indicates that the control table CNVSTEPS has been modified, which is typically related to performance optimization during a data migration or conversion process. This message is part of the SAP Conversion and Migration tools, often used in projects involving data transfer from legacy systems to SAP systems.
Cause: The error occurs when the control table CNVSTEPS, which is used to manage the steps in the conversion process, has been altered in a way that is not compatible with the expected structure or data integrity required by the migration program. This could happen due to: Manual Changes: Someone may have manually modified the CNVSTEPS table, which can lead to inconsistencies. Custom Development: Custom programs or enhancements that interact with the CNVSTEPS table may have inadvertently changed its structure or data. Version Mismatch: If there are different versions of the migration tools or if the system has been upgraded, it may lead
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