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It is a problemin workflow Notification.
OM QUOTE APPROVAL: WF_NOTIFICATION.SEND ERRORS WITH ORA-01422 [ID 1078855.1]
ORA-01422 error happens in wf_notification.send when multiple notifications are sent from single activity in loop. The query which returns more than one row is in WF_NOTIFICATION.send
Look at the note in my answer to my question