Get the point of sale code of the invoice based on the shipping

of the first line of invoice.
#036530

invoice.py

@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import PoolMeta
+from trytond.model import fields
 from trytond.config import config
 import os
 from jinja2 import Environment, FileSystemLoader
@@ -17,6 +18,9 @@ class Invoice:
     __metaclass__ = PoolMeta
     __name__ = 'account.invoice'
 
+    sale_point_code = fields.Function(fields.Char('Sale Point Code'),
+        'get_sale_point_code')
+
     @classmethod
     def __setup__(cls):
         super(Invoice, cls).__setup__()
@@ -29,6 +33,17 @@ class Invoice:
                     'review the tab General of this party: "%(field)s"')
             })
 
+    @classmethod
+    def get_sale_point_code(cls, invoices, name):
+        sale_points = {}
+        for invoice in invoices:
+            sale_point = u''
+            address = invoice.shipment_origin_address
+            if address:
+                sale_point = address.electronet_sale_point
+            sale_points[invoice.id] = sale_point
+        return sale_points
+
     @classmethod
     def generate_facturae_electronet(cls, invoices, certificate_password=None):
         to_write = ([],)

template_facturae_3.2.xml

@@ -71,7 +71,7 @@
                 {% if invoice.party.oficina_contable %}{{ administrative_center(invoice.party.oficina_contable, '01', invoice.party) }}{% endif %}
                 {% if invoice.party.organo_gestor %}{{ administrative_center(invoice.party.organo_gestor, '02', invoice.party) }}{% endif %}
                 {% if invoice.party.unidad_tramitadora %}{{ administrative_center(invoice.party.unidad_tramitadora, '03', invoice.party) }}{% endif %}
-                {% if invoice.invoice_address.electronet_sale_point %}{{ administrative_center(invoice.invoice_address.electronet_sale_point, '04', invoice.party) }}{% endif %}
+                {% if invoice.sale_point_code %}{{ administrative_center(invoice.sale_point_code, '04', invoice.party) }}{% endif %}
             </AdministrativeCentres>
             <LegalEntity>
                 <CorporateName>{{ invoice.party.name and invoice.party.name[:80] or invoice.party.code[:80] }}</CorporateName>

tryton.cfg

@@ -3,6 +3,7 @@ version=4.8.0
 depends:
     ir
     account_invoice_facturae
+    account_invoice_shipment
     account_invoice_sale_relation
     stock_origin_sale
 xml: