[7.0][account_voucher]wrong entry created by account voucher

[Julio Serna-http://www.vauxoo.com]

1.-Steps to reproduce the issue you have observed
Create a customer invoice.
choose any product
put unit price: 1.00
validate invoice
make payment 1 by 0.5
make payment 2 by 0.8
unreconcile payment 1

create other invoice with the same customer
choose any product
put unit price: 1.00
validate invoice
make payment by 1.2
and check journal items of payment

2.- The result you observed
creates journal entries with credit and debit to zero even some with full reconcile

3.-The result you expected
should not create this journal entries

runbot(Build 13251)

Note: I uploaded a video http://youtu.be/iN3oaQyB_xU