Most likely, you're trying to run some code or an action query which
is trying to modify data in a table, when the record that you're
trying to modify is already open on a Form. You can't have a record
open for editing by two different methods.
Try holding down the Shift key to bypass any startup code, and check
to see if you have startup code (or Open event code on your startup
form) which might be doing so.
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