We have some items that are not discountable, so I created on item properties"discountable =yes/no".
On the invoice report I'd like to have the following:
Payable until xx.yy.zzzz: EUR XXXXX <sum of amount of discountable items & based upon BP payment terms discount rate and last date>, until xx.yy.zzzz: EUR <total amount and last date without discount>.
Payable until 14.02.2012 EUR 1960,00 (14 days 2%, 30 days Net.), until 28.02.2012 EUR 2000,00.
I know this is only for the report(paper and screen) and some tables will showup wrong data as the customer pays the discount amount.