In what context did you receive this message?
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.
Let us know if that is the context of your error.