Puchase order modification

Puchase order modification

I noticed that the PO can be modified even if after it is approved and starting partial delivery , which is not correct business practice. Is there any way to prevent modifying the PO after it is approved?

also when I give a user a role to only add and view POs , he can not complete creating PO and the application stuck when he begins entering the Supplier name
I always have to give the user Modify permission to enable him complete the PO creation

please help on this

thank you






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