Message type: E = Error
Message class:  CNV_PE - General messages for posting engine 
Message number: 028
Message text: Parameter mapping &1 is inactive. Check for required repairs skipped
Parameter mapping name: &V1&
Parameter mapping ID: &V2&
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 CNV_PE028 indicates that a parameter mapping in a conversion project is inactive, which can lead to skipped repairs during the data migration or conversion process. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data conversion scenarios.
Cause: Inactive Parameter Mapping: The specific parameter mapping referenced in the error message is not active. This could be due to: The mapping was never activated. The mapping was deactivated intentionally or unintentionally. There may be dependencies or prerequisites that have not been met, preventing the mapping from being activated.
Configuration Issues: There may be issues in the configuration of the migration project or the specific mapping settings. Missing Repairs: The repairs that are supposed to be executed during the migration process are skipped because the mapping is inactive.
Solution: Activate the Parameter Mapping: Go to the relevant transaction or tool where the parameter mapping is defined
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_PE027 Structural mapping &1
What causes this issue?  Structure mapping name: &V1& Structure mapping ID: &V2& Structure mapping description: &V3&System Res...
CNV_PE026 Parameter mapping &1
What causes this issue?  Parameter mapping name: &V1& Parameter mapping ID: &V2& Parameter mapping description: &V3&System Res...
CNV_PE029 No interface mapping found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE030 Parameter of kind &1 and name &2 is missing in split TRule &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.