Use PartBinSearch instead of LotUpdateSelect, you’ll have to figure out how to narrow it down (filter it ) by the selected Part fairly straight forward poke around the forum
As @Chris_Conn said that BO doesn’t carry QOH, but PartBin does carry lot
I’m not sure if PartBinSearch is site/warehouse sensitive.
PartBin doesn’t carry Plant which is an annoyance, thank Mr Codd for that. If you are multisite, you may need to join PlantWhse,PartBin and the CurrentPlant to help filter things a bit more.