I have a subform created and embedded into another form. The subform contains three fields, a line number (PK), a pressure and temperature field. The Pressure and temperature are filled in based on the line number that is displayed. It works correctly when I have the subform itself open. Yet, when I insert it into another form, a valve form, the records will change correctly and everything will update correctly as I go through the valve records, but when I try and change the line that the valve is in. The pressure and temp won't update. The line number is in the valve table, but there is also a line list table which holds all the line numbers, pressures, and temperatures, and that table is what the subform is based off of. Any ideas? Thanks for the help.