After do GR we are not allowed to change a PO price

Question:
Hi guru,
Please advise is it possible to do config: after we do GR then we can't change the PO price...
the purpose of this policy is just want to make sure there is difference between GR price & Invoice price.
Thanks for your help.
Answer:
try to check OMF4.
Hope this helps.
Roman
Answer:
Have a look in this discussion and the linked discussions:
/forums/viewtopic.php?t=74278

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