Incorrect taxable amount when Payment term changed on the order that goes thru order level repricing

this is from JDE 9.0 and we are using order level repricing to apply the discount on total order amount. Discount line gets created in term of M line type, as you can see in the screenshot below. Order total and taxable amount was same when the order was created with default payment term(1.5% discount) but now it shows incorrect taxable amount when user revised the payment term in the order (the revised payment term also for 1.5% discount). So it looks like when user revised the payment term and did "check price" from row option,then the system deducted discount