How to Display Error Msg on Create Receipt Page If Trade Operatn is Not Updated with Latest PO Data?

Business functions in such a way that regularly updating POs (ie, creating PO change orders) is common. For some POs, they create the corresponding trade operation (TO). There are cases where a PO, which has a corresponding TO, is updated (ie, a PO change order is created), and the users proceed to create GRN for that PO WITHOUT syncing the PO change order changes to its corresponding trade operation first.
They have a requirement that if the approved PO change order changes are not synced to its corresponding trade operation, in that case, when they try to create GRN, an error message should be shown: Trade operation is not updated with the latest PO changes, please update the TO and then create GRN.