This summary is not the rule. The rule text controls.
If a parent pays child support for a certain time period under one court order, that payment counts toward what they owe for that same time period under any other support order for the same child. This applies no matter where the other order came from, whether it was issued in New York, another state, or another country.
This rule exists to stop parents from being forced to pay twice for the same period of support. Sometimes more than one court order exists for the same child, especially when families move between states or countries. Without this rule, a parent could end up owing double payments for the same month or period, even though only one payment should be required.
In practice, this means courts will look at what was actually paid and give credit for it, rather than ignoring past payments just because they were made under a different order. This protects parents from unfair double charges and helps keep child support amounts accurate and fair.