Limiting Records with Null only Once

D

Dan

How would I go about limiting a record's existence in a
table by the following criteria. Field A is not null and
field B is not null, or field A is not null and field B
is only null once.

If this can't be done in a table, can it be written into
an append query, as all of the new records are
automatically appended to the table?

Your help is greatly appreciated.

Thanks.

Dan
 

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