Explanation
How can I reject individual items on a multi-item requisition?
You cannot selectively approve or reject individual items. You can edit the requisition to add or delete items, modify requisition quantity, and then approve the requisition. If the approver needs to reject specific lines on the requisition, the approver should reject the entire requisition. The approver can include comments on the worklist task to highlight the rejection reason. The preparer then needs to update the requisition and resubmit it for approval.
References:https://docs.oracle.com/cd/E56614_01/procurementop_gs/OAPRC/F1007478AN174A5.htm