Require approval when specific clause is edited to non-standard on a Purchase Order

When creating and editing the purchase order, the client has the requirement to initiate an approval workflow only when specific clauses are edited to be non-standard. Based on the conditions that have been found within the system, the available routings do not limit to a specific clause, rather any non-standard clause exists. This would create a volume of orders routing for approval which is undesirable for the group to handle.

Are there additional options when routing a purchase order for approval to specify the clause? The below options have been idented, but do not meet the client requirement:

• Nonstandard Clause Exists Equals Yes