Jen explains Back-dating Fixed Asset Retirements. This is especially important when crossing into past years
— Read on jenkuntz.ca/2020/01/back-dating-fixed-asset-retirements/
Back-dating Fixed Asset Retirements – JenKuntz.ca
Archived post from 2020. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.