C.R.S. § 14-5-613
COMMENT
It is not unusual for the parties and the child subject to a child-support order to no longer reside in the issuing state, and for the individual parties to have moved to the same new state. The result is that the child-support order remains enforceable, but the issuing tribunal no longer has continuing, exclusive jurisdiction to modify its order. A tribunal of the state of mutual residence of the individual parties has jurisdiction to modify the child-support order and assume continuing, exclusive jurisdiction. Although the individual parties must reside in the forum state, there is no requirement that the child must also reside in the forum state (although the child must have moved from the issuing state).
Finally, because modification of the child-support order when all parties reside in the forum is essentially an intrastate matter, subsection (b) withdraws authority to apply most of the substantive and procedural provisions of UIFSA, i.e., those found in the act other than in Articles 1, 2, and 6. Note the duration of the support obligation is a nonmodifiable aspect of the original controlling order, See Section 611(c)-(d).