Vetify the tolerances and routing setup for the unit price.
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I will do that and let you know. Thank you for giving someplace to look!
May be your BPO stuck in workflow with error status.
Check with following path :
Login - SYSADMIN > Resp : System Administrator > Workflow > Administrator Workflow > Status Monitor >
Type Internal Name = POAPPRV > User key = (your PO number) > Go
If PO is in error then retry to do the selected activity and restart it with submit button.