Question

I am receiving the below error when I am trying to edit the value of Proj_Mgr in UCM.

Please advise

no permission to perform operation "Make attribute" UCM

Answer 1

You must see an error like:

No permission to perform Make Attribute. 
Must be one of: member of object group, object owner, VOB owner, member of admin group

So check your CLEARCASE_PRIMARY_GROUP environment variable, and compare it to the groups of the vob, or the associated pvob (in UCM).
You can see those by describing the vob:

cleartool descr -l vob:\myVob

As a possible cause, check out the IBM technote
"Problems that occur if the ClearCase Administrator group owns the VOB or VOB objects":

When a VOB or objects contained within a VOB (elements and metadata) are owned by the ClearCase Administrators group, this will most certainly result in permissions errors whenever an operation is performed against that object by a non-Admin user.

Since the administrators group by default has access to all ClearCase objects, it is not necessary to explicitly add that group and should be avoided.

You can see a concrete scenario where that error pops up in:
"Error setting the recommended baselines for this stream" (for a Stream though. In your case, you shouldn’t have to reprotect the Vob, but rather make sure you have the right identity/group).