Difference in cash discount applied in F-28 and in F-32

Hello,

who can explain me why the same document with a paymen term that applies a discount of 30% if customer pay within 30 days and 20% if a customer pay within 40 days, has a differente calculation of cash discount applied if I use the F-32 or the F-28?

Using the F-32 the system applies the correct cash discount instead using the F-28 the system applies always the cash discount of 30%.

Do you know why the cash siscount is calculated in a different way?

Thanks

Regards