Hi, do you mean that the PO approval status is "In Process" and that the Buyer cannot modify to add the Sales Tax group?
If so, Buyer will need to recall the PO to do the modification.
If PO is to be modified by the user to which the work item is assigned, the Approval task has to be 'Approve with edition` (in Workflow editor) for that user to be able to edit. If that is not possible, that approver can reject and Instruct the buyer to add the Tax Group and resubmit.
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