diff --git a/purchase.fodt b/purchase.fodt
index b6cc9e5052..6239611cd3 100644
--- a/purchase.fodt
+++ b/purchase.fodt
@@ -674,7 +674,7 @@
       <text:p text:style-name="P24"><text:placeholder text:placeholder-type="text">&lt;/if&gt;</text:placeholder></text:p>
      </table:table-cell>
      <table:table-cell table:style-name="Table1.D5" office:value-type="string">
-      <text:p text:style-name="P12"><text:placeholder text:placeholder-type="text">&lt;(format_number(line.quantity, purchase.party.lang, digits=line.unit.digits if line.unit else None) + (line.unit and (&apos; &apos; + line.unit.symbol) or &apos;&apos;)) or &apos;&apos;&gt;</text:placeholder></text:p>
+      <text:p text:style-name="P12"><text:placeholder text:placeholder-type="text">&lt;format_number_symbol(line.quantity, purchase.party.lang, line.unit, digits=line.unit.digits) if line.unit else format_number(line.quantity, purchase.party.lang)&gt;</text:placeholder></text:p>
      </table:table-cell>
      <table:table-cell table:style-name="Table1.D5" office:value-type="string">
       <text:p text:style-name="P13"><text:placeholder text:placeholder-type="text">&lt;format_currency(line.unit_price, purchase.party.lang, purchase.currency, digits=line.__class__.unit_price.digits[1])&gt;</text:placeholder></text:p>
diff --git a/purchase.py b/purchase.py
index fe10a91f56..eadd7e2761 100644
--- a/purchase.py
+++ b/purchase.py
@@ -1698,11 +1698,9 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
         Lang = pool.get('ir.lang')
         if self.product:
             lang = Lang.get()
-            return (lang.format(
-                    '%.*f', (self.unit.digits, self.quantity or 0))
-                + '%s %s @ %s' % (
-                    self.unit.symbol, self.product.rec_name,
-                    self.purchase.rec_name))
+            return (lang.format_number_symbol(
+                    self.quantity or 0, self.unit, digits=self.unit.digits)
+                + ' %s @ %s' % (self.product.rec_name, self.purchase.rec_name))
         else:
             return self.purchase.rec_name