I've seen some posts in this forum that refer to UDS's running even during VI Import, but my script is not firing at that time and I need it to.  Is there a special way to do it?

I have a UDS that calculates a value and populates a UDF on the Sales Order Line item.  It works great in Sales Order Entry.  I have it set to the table SO Sales Order Detail, and  the events Column Post-Validate Itemcode, Column Post-Validate OrdQty, Table Set Default Values, and Table Pre-Write.  I added Table Post-Read and Table Post-Write too, but they did not seem to help.  Is there something else I need to do to get it to run? 

We are on v4.4 PU5.  Here is my script in case that helps:

Dim nPallets, nCases, nOrdQty

nPallets=0
nCases=0
nOrdQty = 0

retVal = oBusObj.GetValue("UDF_CASES_PER_PALLET", nCases)
retVal = oBusObj.GetValue("QuantityOrdered", nOrdQty)

if nCases <> 0 then
nPallets = round(nOrdQty/nCases,2)
retVal = oBusObj.SetValue("UDF_PALLETS_PER_ITEM", nPallets)
end if

Thanks, Hollie