AME APEXP workflow hanging in worklist of second approveer in case of parallel approval.

Hello,

We are on R12.1.3  I have issue in APEXP (Expenses) Workflow.

User has created expense report and the workflow has started. After the workflow go through approval process and is completely approved it is not getting cleared from the worklist of second approver( in case of parallel approval).

Now I am trying to clear the expense item which is completely approved form the second responder's worklist by using

           wf_engine.CompleteActivityInternalName or    wf_engine.CompleteActivity

wf_engine.CompleteActivityInternalName (itemtype	=> 'APEXP',
	itemkey	=> '657505-4',
	activity	=> 'APPROVED',
	--'xx_INSUFF_RESPON_BLOCK',
	RESULT	=> wf_engine.eng_null
	);

or

wf_engine.completeactivity (itemtype