HI Guys

Please help me out , please consider the following scenario and help me in getting Solution

To create a credit memo/Notes on Point of sale for returned Product at Point of Sale OpenERP For Example:- Gringberg(Customer) comes to Point of Sale and Purchase on Date 14 may2013 • a Book of 80 Euro with 19 % Taxes • a DVD of 20 Euro with 7 % Taxes. • Total of 2 product with 100 Euro he has paid via Cash 100Euro. Accounting Journal entries has been registered with Cash Journal(At payment), Sales Journal(At POS orders) .

Now after 7 days at 21 May 2013 Gringberg comes and returned a book at Point of sale when Session was opened, A Sales guy at Point of Sale has Accepted the product and returned the product from Customer location to Stock location and completed the Process, But Sales guy did not refunded instead he has given a Credit Note/Memo to Customer with 80 Euro.

Now After 3 days at 25May 2013 Gringberg again came and purchased again 2 Books which cost 180euro (Each 90 euro and with 19 %).

Now here , How a sales guy can Redeem the Credit Note ? and pay the left amount via card/cash What Entry need to create at Accounting Journal? At Point of Sale how to write off Credit note with Gringberg?