diff --git a/modules/purchase_blanket_agreement/purchase.py b/modules/purchase_blanket_agreement/purchase.py
index 559bc8598c..65c2760a36 100644
--- a/modules/purchase_blanket_agreement/purchase.py
+++ b/modules/purchase_blanket_agreement/purchase.py
@@ -837,9 +837,10 @@ class Line(metaclass=PoolMeta):
         pool = Pool()
         Uom = pool.get('product.uom')
         if self.unit.category == line.unit.category:
-            return Uom.compute_qty(
-                self.unit, (self.actual_quantity or self.quantity), line.unit,
-                round=round)
+            quantity = (
+                self.actual_quantity if self.actual_quantity is not None
+                else self.quantity)
+            return Uom.compute_qty(self.unit, quantity, line.unit, round=round)
         return 0
 
 
diff --git a/modules/purchase_secondary_unit/purchase.py b/modules/purchase_secondary_unit/purchase.py
index 13ebf31e6b..caed97a5e6 100644
--- a/modules/purchase_secondary_unit/purchase.py
+++ b/modules/purchase_secondary_unit/purchase.py
@@ -359,8 +359,11 @@ class LineBlanketAgreement(metaclass=PoolMeta):
         quantity = super().quantity_for_blanket_agreement(line, round=round)
         if (self.secondary_unit
                 and self.secondary_unit.category == line.unit.category):
+            purchase_line_quantity = (
+                self.actual_quantity if self.actual_quantity is not None
+                else self.quantity)
             quantity = Uom.compute_qty(
-                self.unit, (self.actual_quantity or self.quantity), line.unit,
+                self.unit, purchase_line_quantity, line.unit,
                 factor=self.secondary_uom_factor,
                 rate=self.secondary_uom_rate,
                 round=round)
diff --git a/modules/sale_blanket_agreement/sale.py b/modules/sale_blanket_agreement/sale.py
index 39f2242d12..6eee5426e7 100644
--- a/modules/sale_blanket_agreement/sale.py
+++ b/modules/sale_blanket_agreement/sale.py
@@ -773,9 +773,10 @@ class Line(metaclass=PoolMeta):
         pool = Pool()
         Uom = pool.get('product.uom')
         if self.unit.category == line.unit.category:
-            return Uom.compute_qty(
-                self.unit, (self.actual_quantity or self.quantity), line.unit,
-                round=round)
+            quantity = (
+                self.actual_quantity if self.actual_quantity is not None
+                else self.quantity)
+            return Uom.compute_qty(self.unit, quantity, line.unit, round=round)
         return 0
 
 
diff --git a/modules/sale_secondary_unit/sale.py b/modules/sale_secondary_unit/sale.py
index 5ba76ae163..33bd7c5f85 100644
--- a/modules/sale_secondary_unit/sale.py
+++ b/modules/sale_secondary_unit/sale.py
@@ -308,8 +308,11 @@ class LineBlanketAgreement(metaclass=PoolMeta):
         quantity = super().quantity_for_blanket_agreement(line, round=round)
         if (self.secondary_unit
                 and self.secondary_unit.category == line.unit.category):
+            sale_line_quantity = (
+                self.actual_quantity if self.actual_quantity is not None
+                else self.quantity)
             quantity = Uom.compute_qty(
-                self.unit, (self.actual_quantity or self.quantity), line.unit,
+                self.unit, sale_line_quantity, line.unit,
                 factor=self.secondary_uom_factor,
                 rate=self.secondary_uom_rate,
                 round=round)