This summary is not the rule. The rule text controls.
Once a support order from another state gets registered here in Louisiana and then confirmed, that order becomes final and locked in. Confirmation can happen automatically if nobody challenges it in time, or it can happen after a hearing where a judge looks at the case.
Once that confirmation happens, you lose your chance to raise certain arguments against the order later on. Specifically, you can't go back and challenge anything you could have brought up when the order was first registered. If you had a problem with the order, like thinking the amount was wrong or the original court didn't have the right to issue it, you needed to speak up during the registration process.
This rule exists to bring closure to these cases. Without it, people could keep relitigating the same issues over and over, which would make child support orders unstable and hard to enforce. So if you receive notice that a support order is being registered in Louisiana, it's important to act quickly and raise any objections right away, because once it's confirmed, that window closes.