That's a legal question for your attorney, or for your ex to pursue (I'm sure the case can be transferred to your current state).
Suppose a court order says "you must buy milk for your child and bring it to the other parent's home." Would it be invalid because it doesn't specify which type of milk, or whether you needed to use a car or a bicycle? Or would the court expect common words to have the meaning they commonly have.
Likewise, if the order says "parent 2 may claim the child as a dependent in odd numbered years", is it unenforceable because it does not specify the exact mechanism by which this is done?
We are not attorneys. We can only explain the IRS position. Everything else is between you, your ex, and the courts.
