When the partner is missing, the error message is not clear enough. This commit adds a new error message to clarify the issue. Task ID: 3438559 closes odoo/odoo#132029 X-original-commit: 5be853ebb6da19a4f0a147944995583e234bf1b9 Related: odoo/enterprise#45779 Signed-off-by: Laurent Smet (las) <las@odoo.com> Signed-off-by: Naceur Amine Saddem (sana) <sana@odoo.com>