Enter profile role or role number for the time slice

What causes this issue?

You tried to allocate a new profile to this register for another
period. This is not possible, because the profile role and the role
number of the allocation could not be uniquely identified.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

The following options are available for identifying the role/role
number:
Choose a combination of role/role number from the tree.
Select an existing profile allocation with the required combination of
role and role number.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.