[IMP] Improved code.

fieldservice_account_analytic/data/ir_rule.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="utf-8" ?>
 <odoo>
     <record id="analytic_account_fsm_manager" model="ir.rule">
         <field name="name">account.analytic.line.fsm.manager</field>

fieldservice_account_analytic/models/__init__.py

@@ -1,7 +1,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 from . import (
-    account_invoice_line,
+    account_move,
     analytic_account,
     fsm_location,
     fsm_order,

fieldservice_account_analytic/models/account_move.py

@@ -0,0 +1,22 @@
+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import _, api, models
+from odoo.exceptions import ValidationError
+
+
+class AccountMoveLine(models.Model):
+    _inherit = "account.move.line"
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            order = self.env["fsm.order"].browse(vals.get("fsm_order_id"))
+            if order:
+                if order.location_id.analytic_account_id:
+                    vals["analytic_account_id"] = order.location_id.analytic_account_id.id
+                else:
+                    raise ValidationError(
+                        _("No analytic account " "set on the order's Location.")
+                    )
+        return super(AccountMoveLine, self).create(vals_list)

fieldservice_account_analytic/models/fsm_order.py

@@ -56,7 +56,6 @@ def _onchange_customer_id_location(self):
         if self.customer_id:
             self.location_id = self.customer_id.service_location_id
 
-    @api.multi
     def write(self, vals):
         res = super(FSMOrder, self).write(vals)
         for order in self: