Duplications in Role assignments - Still a problem

Hello Everyone,

Am a newbie to SAP Security. Could you please help me with the below question.

Why SAP does not recognize the duplicate assignment of a role during the role assignment for a user ?

For eg : the user ABC has the below roles in SAP

X:P7_9053_VA01  valid until 31.12.9999

X:P7_8200_VA02  valid until 31.12.9999

Whenever I try to assign any of the above two roles once again to user ABC, why don't we get a message that the roles are already assigned and valid ?

It would be very helpful if we get a message during the assignment as it will help to avoid the Profile Overflow problem.

Thanks in advance for your answers.