Message type: E = Error
Message class:  CNVHCM_PRESEL - TDMS4HCM: Messages for Object Selection 
Message number: 006
Message text: Selection ID &1 is locked; unlock first before making changes
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.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message CNVHCM_PRESEL006 indicates that a selection ID is currently locked, preventing any changes from being made to it. This typically occurs in the context of data migration or data selection processes, particularly in the Human Capital Management (HCM) module.
Cause: Locked Selection ID: The selection ID you are trying to modify is locked by another user or process. This can happen if: Another user is currently editing the selection ID. A previous session did not close properly, leaving the selection ID in a locked state. A background job is using the selection ID.
Solution: To resolve this issue, you can follow these steps: Check Lock Status: Use transaction code SM12 to check for locks on the selection ID. You can enter the selection ID in the appropriate field to see if it is locked and by whom. Unlock the Selection ID: If you find that the selection ID is locked by another user and you have the necessary
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNVHCM_PRESEL005 Error in execution of selection "&2" (technical ID &3)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL004 Specify criteria for selection
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL010 You are not authorized to display selections; contact your syst. admin.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL011 You are not authorized to modify selection ID &1; contact sys. admin.
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.