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modules/sale_subscription/invoice.py

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+# 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 Pool, PoolMeta
+
+
+class InvoiceLine(metaclass=PoolMeta):
+    __name__ = 'account.invoice.line'
+
+    @property
+    def origin_name(self):
+        pool = Pool()
+        SubscriptionLine = pool.get('sale.subscription.line')
+        name = super().origin_name
+        if isinstance(self.origin, SubscriptionLine) and self.origin.id >= 0:
+            name = self.origin.subscription.rec_name
+        return name
+
+    @classmethod
+    def _get_origin(cls):
+        models = super()._get_origin()
+        models.append('sale.subscription.line')
+        return models