diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 19f32c0..a579c4c 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -770,14 +770,22 @@ class SaleLine(metaclass=PoolMeta):
             pricing_rule = self.pricing_rule
         return pricing_rule
 
-    @property
-    def get_pricing_text(self):
-        pricing_text = ''
-        if self.price_components:
-            for pc in self.price_components:
-                if pc.price_index:
-                    pricing_text += 'ON ' + pc.price_index.price_desc + ' ' + (pc.price_index.price_period.description if pc.price_index.price_period else '')
-        return pricing_text
+    @property
+    def get_pricing_text(self):
+        parts = []
+        if self.price_components:
+            for pc in self.price_components:
+                if pc.price_index:
+                    price_desc = pc.price_index.price_desc or ''
+                    period_desc = (
+                        pc.price_index.price_period.description
+                        if pc.price_index.price_period else '') or ''
+                    part = ' '.join(
+                        piece for piece in ['ON', price_desc, period_desc]
+                        if piece)
+                    if part:
+                        parts.append(part)
+        return ' '.join(parts)
     
     @fields.depends('product')
     def on_change_with_attribute_set(self, name=None):