You can initiate retrospective amortization processing by an amortization rule change. Whenever an amortization rule is found in normal earnings processing, the amortization rule Instance is stored on the lot in tag 4256. Each time the earnings process is run, the system checks the amortization rule Instance on the lot level (tag 4256) to see if the Instance changed. If the amortization rule Instance changed, the earnings process initiates a retrospective amortization calculation. It sets up the retrospective amortization calculation based on two additional tags:
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