🚀 go-pugleaf

Hi!
I Want to set the flowName to "B" for all graphics in a document, but my code doesn't work...
Is there some logical error here that I don't see?
Here's my code:

VoidT setFlowName(F_ObjHandleT docId)
{
	F_ObjHandleT pageId, pageFrameId, graphicFrameId, flowId;

F_ApiAlert("Starting!",FF_ALERT_CONTINUE_NOTE);

	pageId = F_ApiGetId(FV_SessionId, docId, FP_FirstBodyPageInDoc);
	/* Page by page*/
	while(pageId)
	{
		/* Getting pageFrame*/
		pageFrameId = F_ApiGetId(docId, pageId, FP_PageFrame);

		graphicFrameId = F_ApiGetId(docId, pageFrameId, FP_FirstGraphicInFrame);
		while(graphicFrameId)
		{
			flowId = F_ApiGetId(docId, graphicFrameId, FP_Flow);

			F_ApiSetString(docId, flowId, FP_Name, (StringT)"B");
		}

		pageId = F_ApiGetId(docId, pageId, FP_PageNext);	
	}

F_ApiAlert("Done!",FF_ALERT_CONTINUE_NOTE);
}

In advance thanks!:)