MB01 restriction by M_BEST_EKG

Question: Gentlemen
Can we restrict the transaction MB01 for specific purchasing group?
So that we will restrict the users to just make GRN based on the PO with the purchasing group(x)
and if he or she Try to make the GRN for purchasing group (y) The authorization error will appear

the object Purchasing Group in Purchase Order(M_BEST_EKG)
is not checking the filed of the Purchasing Group even if i restrict this field for specifc Purchasing Group
it will allow all the groups to make the GRNs
Thanks

Answer:
Gentlemen
Can we restrict the transaction MB01 for specific purchasing group?
So that we will restrict the users to just make GRN based on the PO with the purchasing group(x)
and if he or she Try to make the GRN for purchasing group (y) The authorization error will appear

the object Purchasing Group in Purchase Order(M_BEST_EKG)
is not checking the filed of the Purchasing Group even if i restrict this field for specifc Purchasing Group
it will allow all the groups to make the GRNs
Thanks

Use the user exit to call an additional authority check based on grp.
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