Continuing Exclusive Jurisdiction
Theory that only one support order should be valid between the same people at a time. And when a court hears a child support case, it can add to and change that order. The court of continuing exclusive jurisdiction (CCEJ) has control over a support case until another court takes it away. This is defined in the Uniform Interstate Family Support Act (UIFSA). (See Uniform Interstate Family Support Act.)
Source: California Courts.