Sage 100 2017. Want to write back the value of a UDF in PO Return Detail to the PO Detail when the Return Register is updated. Have all the UDFs set up and linked but the data does not write back to PO Detail. UDF is a checkbox, manual entry from PO Return Detail. The Receipt History UDF is updated from the Return Register. The PO Detail UDF is updated from the Return Register. What am I missing?