Field cannot be updated. (Error 3164)

C

chibis

My database has been working for several years and today I began receiving
this error message when I was trying to edit new record on a form. Here is
what happens:
The form is linked to 2 tables. A new record is added to the form with the
help of macros which pre-fills some of the controls on the form linked to
table1. Then I need to fill out the controls that are linked to table2 and
fill and/or edit controls linked to table1. When I am trying to edit/fill
controls linked to table1 that is when I am getting an error message.
However, if I save the record and try it again, they are editted without
problem.
Any ideas on what has gone wrong? Please help. Any piece of advise is
appreciated.
Thank you.
 
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