Trade Allowance agreements are copied to mimic item and Merchandising Event setup. Customers are changed on the copied TAAs but the off invoice discounts on the copied TAA is applying to the original TAA's customer. This is incorrect and can lead to over discounted line items.
The hotfix can resolve this issue.
TAMPROMOTIONITEM table is getting an correct PromotionID copied in when you copy a Trade Allowance Agreement it corrupts both the original and the copied to trade agreement