How to RETRY/SKIP a workflow from backend

Script to RETRY workflow

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

Script to SKIP workflow

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