Message type: E = Error
Message class:  CNVHCM_PRESEL - TDMS4HCM: Messages for Object Selection 
Message number: 246
Message text: Selection last locked by user &1 on &2 at &3
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The SAP error message CNVHCM_PRESEL246 indicates that a selection or operation you are trying to perform is currently locked by another user. This typically occurs in scenarios where multiple users are trying to access or modify the same data simultaneously, leading to a conflict.
Cause: Data Locking: The error occurs because the data you are trying to access is locked by another user. This is a common occurrence in SAP systems to prevent data inconsistencies. Long-running Transactions: If a user has a long-running transaction, it may hold locks on the data for an extended period, causing other users to encounter this error. User Sessions: Sometimes, a user may have multiple sessions open, and one of them may be holding a lock on the data.
Solution: Wait and Retry: The simplest solution is to wait for the other user to complete their transaction and then try again. Identify the Lock: You can use transaction codes like SM12 (Display
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