How to RETRY/SKIP a workflow from backend

BEGIN
wf_engine.handleerror
		(
			itemtype  => 'OEOL',
			itemkey   => 2705276,
			activity  => 'SHIP_LINE',
			command   => 'RETRY',
			RESULT    => NULL
		);
END;
/
COMMIT;

BEGIN wf_engine.handleerror ( itemtype => 'OEOL', itemkey => 2705276, activity => 'SHIP_LINE', command => 'RETRY', result => NULL ); END; / COMMIT;

BEGIN
wf_engine.handleerror
		(
			itemtype  => 'OEOL',
			itemkey   => 2705276,
			activity  => 'SHIP_LINE',
			command   => 'SKIP',
			RESULT    => NULL
		);
END;
/
COMMIT;

BEGIN wf_engine.handleerror ( itemtype => 'OEOL', itemkey => 2705276, activity => 'SHIP_LINE', command => 'SKIP', result => NULL ); END; / COMMIT;