Can't add or change record. Referential integrity rules require a related record in table 'Item'.
You tried to perform an operation that would have violated referential integrity For example, this error occurs if you try to change or insert a record in the "many" table in a one-to-many relationship , and that record doesn't have a related record in the table on the "one" side. rules for related tables.
If you want to add or change the record, first add a record to the "one" table that contains the same value for the matching field.