A problem occured with a required Many2One inside an X2Many (e.g.
order_line field in sale.order form view). If the user clicked on
'Add an item' to add a row, then typed some text in the Many2One,
then clicked on 'Create ...' to quick create a new product, and
then directly clicked on 'Add an item' to add another row (before
the name_create returned), the first row was discarded.
This was because before the name_create returns, the Many2one still
has no value, and as it is required, the row was considered invalid
and then discarded.
This rev. ensures to wait for the name_create to return before
trying to save the row and to create a new one.
Aaron Bohy
5c4485d182