Bug

modules/account/move.py

@@ -1123,6 +1123,10 @@ class Line(DescriptionOriginMixin, MoveLineMixin, ModelSQL, ModelView):
         if self.amount_second_currency and amount:
             return round(abs(self.amount_second_currency) / amount, 6)
 
+    def _set_rate_from_amounts(self):
+        if self.amount_second_currency and not self.rate:
+            self.rate = self.get_rate()
+
     @fields.depends(
         'debit', 'credit',
         'date','second_currency','amount_second_currency', 'rate',
@@ -1286,6 +1290,7 @@ class Line(DescriptionOriginMixin, MoveLineMixin, ModelSQL, ModelView):
             self.amount_second_currency = \
                 self.amount_second_currency.copy_sign(
                     (self.debit or 0) - (self.credit or 0))
+        self._set_rate_from_amounts()
 
     @fields.depends('account')
     def on_change_account(self):
@@ -1590,6 +1595,13 @@ class Line(DescriptionOriginMixin, MoveLineMixin, ModelSQL, ModelView):
                 for fname in move_fields(move_name=False):
                     vals.setdefault(fname, None)
         lines = super(Line, cls).create(vlist)
+        to_save = []
+        for line in lines:
+            if line.amount_second_currency and not line.rate:
+                line._set_rate_from_amounts()
+                to_save.append(line)
+        if to_save:
+            cls.save(to_save)
         period_and_journals = set((line.period, line.journal)
             for line in lines)
         for period, journal in period_and_journals: