Unable to approve the change order requested against the PO
Approval workflow database error occurs while approving Standard Purchase Order
Contact your system administrator to identify the problem and to use SQL* Plus or workflow monitor to reactivate the approval workflow where it left off.
Give your system administrator the following information:
PL/SQL procedure: PO_REQAPPROVAL_INIT1.REGISTER_DOC_SUBMITTED
Error: ORA-00060: deadlock detected while waiting for resource
When checking backend, there is no locking session. And when the PO was checked, it was stuck in "IN Process" & "CLOSED" status. Also the notification that the change requested was approved was received by the requisition owner.