A contract with an owner includes several line items which were approved by a pre-job schedule of values. One line item is for a small aspect, and the value for that line was established in the contact to be $2980. The owner, without our knowledge, hired someone else to perform the work associated with that line item. I planned to strike the line from the final pay app, and just not bill them for it, but the architect sent a deductive change order in the amount of $3278, a 10% increase over the line item value. He said the contract stipulated that 10% markup is applied on change directives. Can they demand we credit them 110% of a line item value that is clearly established in the contract?