Check field &-& missing from foreign key field definition

What causes this issue?

The (check) field with which the foreign key of his table is defined
is not contained in the assignment of foreign key fields to primary key
fields.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

When defining foreign key fields, you must take the check field into
account.

Error message extract from SAP system. Copyright SAP SE.