for this to done go to tcode:omet
create new authorisation
and assign prequisition field as required and give nbf as refernce document type
an save it.
now go to su01 and give user name and give parameter efb and asign ur create authorisation and save it log off and log in and try ur result in me21n/me21
if u require further details
i will help u
with regards
chaitanya
There is user exit which is available for PO at the time of saving.contact your Abaper and ask them to use the user exit and check the condition if the PR field for any line item is empty then the user exit has to be called and should not allow to save the PO
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