What is the name of your state? ca. i have a support order issued in Colorado which is in arrears and has been registered for enforcement here. Colorado does not charge and has not ordered interest to be paid on the arrears, and shows my balance at $5300.00. However the local enforcement unit IS chargeing me interest and even though I have been paying both the current amount and the amount Colorado told me to pay towards arrears my balance according to Calif has gone up to $8020.00. Isnt adding non ordered interest considered "modification" of the order? and what proceedure or forms do i need to file to get them to follow the Colorado order?