Message type: E = Error
Message class:  CNV_LTHCM_S_10 - LT HCM: Message Class for Data Selection 
Message number: 012
Message text: HCM object selection ID &1 (&2) is not locked
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The SAP error message CNV_LTHCM_S_10012 typically occurs in the context of the SAP Landscape Transformation (SLT) or during data migration processes, particularly when dealing with Human Capital Management (HCM) objects. This error indicates that the specified HCM object selection ID is not locked, which can lead to issues during data migration or transformation processes.
Cause: The error message suggests that the system is trying to perform an operation on an HCM object selection ID that is expected to be locked for processing, but it is not. This can happen due to several reasons: Concurrent Access: Another process or user might be accessing or modifying the same HCM object, preventing the lock from being established. Locking Mechanism Failure: The locking mechanism in SAP may not have functioned correctly, leading to the object not being locked as expected.
Configuration Issues: There may be configuration issues in the migration or transformation settings that prevent proper locking of the
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