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The 2455 error starts out with something like "You entered an expression
that has an invalid reference..." Going to Google the general
impression was that a reference was missing. At MS, there's not much
info on it. So...this is FYI in case you ever get this error. It may
not be the cause of it, but it could be also.
I had a form that opened another form and sometimes it'd open fine,
other times blow up. I couldn't easily see what the diff was in
records...why some would work and others wouldn't.
It ended up I was opening the many-side table of a 1-many tables
relationship and setting a filter. And I was opening with develpment
records, not production records. And the ones I was opening were when I
first created the app. So...what had happened is that way back when the
1-side table record had been deleted. The many-side record remained.
So, if you get this error and are frantically head-scratching what the
cause is, see if you are using many-side records that may have been
orphaned.
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