Check invoice state on report workflow transitions.

aeat.py

@@ -403,7 +403,8 @@ class SIIReport(Workflow, ModelSQL, ModelView):
     @ModelView.button
     @Workflow.transition('confirmed')
     def confirm(cls, reports):
-        pass
+        for report in reports:
+            report.check_invoice_state()
 
     @classmethod
     @ModelView.button
@@ -421,6 +422,7 @@ class SIIReport(Workflow, ModelSQL, ModelView):
         for report in reports:
             if report.state != 'confirmed':
                 continue
+            report.check_invoice_state()
             if report.book == 'E':  # issued invoices
                 if report.operation_type in {'A0', 'A1'}:
                     report.submit_issued_invoices()
@@ -469,6 +471,13 @@ class SIIReport(Workflow, ModelSQL, ModelView):
                 cls._save_response(report.response)
                 report.save()
 
+    def check_invoice_state(self):
+        for line in self.lines:
+            if line.invoice and line.invoice.state not in ('posted', 'paid'):
+                raise UserError(gettext(
+                    'aeat_sii.msg_report_wrong_invoice_state',
+                    invoice=line.invoice.rec_name))
+
     @classmethod
     @ModelView.button
     def load_invoices(cls, reports):

locale/es.po

@@ -1785,4 +1785,8 @@ msgstr ""
 
 msgctxt "model:res.group,name:group_invoice_sent_sii_posted2draft"
 msgid "Force Draft Account Invoice sent to SII"
-msgstr "Forzar borrador factura enviada a SII"
+msgstr "Forzar borrador factura enviada a SII"
+
+msgctxt "model:ir.message,text:msg_report_wrong_invoice_state"
+msgid "Invoice \"%(invoice)s\" must be posted or paid."
+msgstr "La factura \"%(invoice)s\" debe estar contabilizada o pagada."

message.xml

@@ -46,6 +46,8 @@ If you edit them take care if you need to update again to SII</field>
         </record>
         <record model="ir.message" id="msg_invoice_deny_modify_sii_pk">
             <field name="text">Cannot modify "%(fields)s" on invoice "%(invoice)s" because its SII state is "%(sii_state)s". Please first include the invoice in a Delete Invoice SII Book and send to AEAT.</field>
+        <record model="ir.message" id="msg_report_wrong_invoice_state">
+            <field name="text">Invoice "%(invoice)s" must be posted or paid.</field>
         </record>
     </data>
 </tryton>