You can use the Link Rule tab in the Link Rules application to change fields and clauses on existing link rules.
A link rule must have at least one link rule clause. If you attempt to delete all link clauses from a link rule, an error message is displayed when you save the link rule, and the clauses are not deleted.
When you save a modified link clause, the link rule is evaluated to determine whether the clauses are valid expressions. If a clause is not valid, an error message is displayed, and the link rule is not saved.