Before this commit, the margin in the sale_total group was following the total. It was preventing putton another field before the margin. This commit allows putting another field before the margin without depending on the installation order. closes odoo/odoo#116820 Taskid: 3232957 X-original-commit: 03286dffa8693edce846c064795e8a26d5b61890 Related: odoo/enterprise#38886 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com> Signed-off-by: Arnaud Joset <arj@odoo.com>