Adding pay elements to absence plan other than 1/1/1951

Summary: Need to add pay elements to absence plan on a later date other than 1/1/1951 (being the plan's effective start date).

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My objective is to add pay elements on a later date such date My Absence Plan creation (effective start date is 1/1/1951) and I add pay elements effective 1/1/2026. I tested out these scenarios but I am unable to apply absences.

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