Additional payment, bank statement and voucher addons for OpenERP

Merge proposals dependent on lp://staging/~pablocm/account-payment/7.0-account-payment-extension-fix-invoice-field

  1. 7.0-account-payment-extension-fix-invoice-field
  2. Dependent merge proposals

lp://staging/~pablocm/account-payment/7.0-account-payment-extension-fix-invoice-field has no merge proposals.