.openerp .oe_form_sheet_width {
  max-width: 1000px;
}
.openerp .oe_form_sheet_width {
  max-width: 1000px;
}
.openerp .oe_list_group_name {
  max-width: 50px;	
}

Correct css for column 'group'
[FIX] Correct css for column 'group'