The whole POINT of having an order is to cut out the freakin' back-and-forth negotiating every visit and payment.
I'd just tell him, "Sorry, we are sticking with the order." Repeat, don't argue it. Just keep saying, "We have an order and we're following it."
Of course, there might be a truly unusual situation where one of you needs to deviate. But those should be rare, not anticipated, and compelling (e.g., someone's family member is dying).