IMP l10n_it_reverse_charge adding original_purchase_tax_id to allow m…

…apping of 3 documents: original supplier invoice (intra/extra), supplier self invoice, customer self invoice

l10n_it_reverse_charge/models/account_invoice.py

@@ -390,9 +390,6 @@ def generate_self_invoice(self):
 
     def generate_supplier_self_invoice(self):
         rc_type = self.fiscal_position_id.rc_type_id
-        if not len(rc_type.tax_ids) == 1:
-            raise UserError(_(
-                "Can't find 1 tax mapping for %s" % rc_type.name))
         if not self.rc_self_purchase_invoice_id:
             supplier_invoice = self.copy()
         else:
@@ -410,8 +407,19 @@ def generate_supplier_self_invoice(self):
         supplier_invoice.partner_id = rc_type.partner_id.id
         supplier_invoice.journal_id = rc_type.supplier_journal_id.id
         for inv_line in supplier_invoice.invoice_line_ids:
-            inv_line.invoice_line_tax_ids = [
-                (6, 0, [rc_type.tax_ids[0].purchase_tax_id.id])]
+            line_tax_ids = inv_line.invoice_line_tax_ids
+            tax_ids = list()
+            for tax_mapping in rc_type.tax_ids:
+                for line_tax_id in line_tax_ids:
+                    if tax_mapping.original_purchase_tax_id == line_tax_id:
+                        tax_ids.append(tax_mapping.purchase_tax_id.id)
+            if not tax_ids:
+                raise UserError(_("Tax code used is not a RC tax.\nCan't "
+                                  "find tax mapping"))
+            if line_tax_ids:
+                inv_line.invoice_line_tax_ids = [
+                    (6, False, tax_ids)]
+
             inv_line.account_id = rc_type.transitory_account_id.id
         self.rc_self_purchase_invoice_id = supplier_invoice.id
 

l10n_it_reverse_charge/models/account_rc_type.py

@@ -3,8 +3,7 @@
 # Copyright 2017 Lorenzo Battistini - Agile Business Group
 # Copyright 2017 Marco Calcagni - Dinamiche Aziendali srl
 
-from odoo import fields, models, _, api
-from odoo.exceptions import ValidationError
+from odoo import fields, models
 
 
 class AccountRCTypeTax(models.Model):
@@ -16,6 +15,10 @@ class AccountRCTypeTax(models.Model):
         string='RC type',
         required=True,
         ondelete='cascade')
+    original_purchase_tax_id = fields.Many2one(
+        'account.tax',
+        string='Original Purchase Tax',
+        required=False)
     purchase_tax_id = fields.Many2one(
         'account.tax',
         string='Purchase Tax',
@@ -85,14 +88,3 @@ class AccountRCType(models.Model):
     company_id = fields.Many2one(
         'res.company', string='Company', required=True,
         default=lambda self: self.env.user.company_id)
-
-    @api.multi
-    @api.constrains('with_supplier_self_invoice', 'tax_ids')
-    def _check_tax_ids(self):
-        for rctype in self:
-            if rctype.with_supplier_self_invoice and len(rctype.tax_ids) > 1:
-                raise ValidationError(_(
-                    'When "With additional supplier self invoice" you must set'
-                    ' only one tax mapping line: only 1 tax per invoice is '
-                    'supported'
-                ))

l10n_it_reverse_charge/views/account_rc_type_view.xml

@@ -60,6 +60,7 @@
                                     'readonly': [('method', '!=', 'selfinvoice')],
                                     'required': [('method', '=', 'selfinvoice')]}">
                             <tree string="Tax Mapping" editable="bottom">
+                                <field name="original_purchase_tax_id" />
                                 <field name="purchase_tax_id" />
                                 <field name="sale_tax_id" />
                             </tree>