Stop users from increasing amount on Requisition already tagged to POs

Hi. We have a requirement where we would like to not allow users to increase the amount on a requisition when there is already a Purchase Order associated with that requisition. Has anyone implemented this? Can you please tell me the change needs to be made to the REQAPPRV workflow. All help/insight is greatly appreciated.
Thanks and regards
K

As far as I am aware we cannot modify a requisition that is already approved. And I guess you would be release the requisition to a PO only when it is approved. Then how can the users change the amount on a requisition. Correct me if I am missing some thing.

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Stop users from increasing amount on Requisition already tagged to POs

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