I had the need to lookup fields on the current labor record from the Report Quantity screen. The LaborHedSeq and LaborDtlSeq are not available in any view (that I could find). They are passed to the form at launch and used to call GetNewReportQty.
For anyone going through similar pain, I wanted to share the solution. You can grab them from ValueIn.
using System.Collections;
using System.Collections.Specialized;
StringDictionary valueIn = (StringDictionary)RQForm.LaunchFormOptions.ValueIn;
string laborHed = valueIn["LaborHead"];
string laborDtl = valueIn["LaborDet"];