Is this a problem when you are doing proforma from 2019 to 2020? Google yields a few possibles https://www.google.com/search?q=lacerte+bridge+error&rlz=1C1OKWM_enUS926US926&oq=lac&aqs=chrome.0.69...

Before doing the proforma, spend a few minutes with each 2019 file to check accuracy, especially to state, carryovers and depreciation. If the return matches what is filed go to screen 3 and find a check mark at the bottom of the 1st section and REMOVE IT before doing the proforma.