2854114 - Approval task of supplier invoice is not appearing under Managing my area

Supplier approval task that is appearing under Business task management view with a person assigned to it ,but that person is not seeing this task in his managing my area work center. or if you want to find why the task is appearing unassigned under Business task management view

SAP Business ByDesign

Cannot see the task under approvals, not  appearing in mobile but not in managing my area, un assigned task is appearing, task is unassigned , KBA , no task in managing my area , unassigned task , AP-SIP , Supplier Invoice Processing , AP-SLO , Sales Order Processing , AP-POP-PO , Purchase Order , Problem