I have faced the same problem at my end and I have faced the one more problem is there that is the "Journal" does not passed in invoice.
Steps to reproduce:
1) Install the Sale and purchase module.
2) Install the chart for Openerp.S.A and Shop1 both company.
3) create a two more invoice for a same partner and create the invoice with group the invoice wizard.
Hello,
I have faced the same problem at my end and I have faced the one more problem is there that is the "Journal" does not passed in invoice.
Steps to reproduce:
1) Install the Sale and purchase module.
2) Install the chart for Openerp.S.A and Shop1 both company.
3) create a two more invoice for a same partner and create the invoice with group the invoice wizard.
Now you have faced this another problem also.
Thanks.