Here's a wild guess:
- This error occurs in a subform.
- The subform is bound to a query.
- The query contains 2 (or more) tables.
- You are trying to add a record to the related table.
- There are fields in the lookup table that have a Default Value.
If that is accurate, the problem is triggered when Access uses the Default
Value in the table on the one-side of the relationship and tries to add a
record there. Removing the Default Value from the fields in that table
avoids the problem.
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