Produmex Scan - Stock Transfer UoM

Hi,

I would like to make a customisation that will allow me to automatically set the UoM on a stock transfer screen to the default sales UoM. I have tried changing [TextUoM] but this only alters the display. I also tried changing [SelectedBinLocationStockForTransfer.UoMEntry] and [SelectedBinLocationStockForTransfer.UoM] but these didn't seem to change anything. How can I acheive this?