As the error reports are repeating, for up to 5 years, it is intermittent.
It is quite common to work the first time a details list is entered, and just as intermittently buggy when you try to go back and modify those entries, and/or attempt to make changes to a list that was entered in a prior year.
There are multiple threads of the same topic using variations of the same problem but slightl different vocabularies.
