@ckrusen
this issue is called, historical data update, unfortunately, you need to deal with them separately, i.e. if you are keeping the data somewhere, then you can you use Updatable BAQ/Dashboard or DMT to update these UD fields, this is what i had to do when i create a UD filed in PartRev to store the FAIR Date as we keep this information in spread sheet, if you do not, then it will be null/blank.