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how to do Openerp 7 POS touch screen, the existing module works discount and tax calculated separately for each of the product, i need to calculate discount for all the product total and then i assigned tax for that discounted value, is there any module avail in openerp???? or how to do this plz give me a suggestion

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I need something like this too.

You need to build a module for this feature, and i think it is easy to do..%