diff --git a/line.py b/line.py
index c388bde..e947cce 100644
--- a/line.py
+++ b/line.py
@@ -622,18 +622,31 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
                         return self.booktransf.quantity_uom.id
 
     @fields.depends('feature', 'cashbook', '_parent_cashbook.quantity_digits', \
-        'booktransf', '_parent_booktransf.quantity_digits', '_parent_booktransf.feature')
+        'booktransf', '_parent_booktransf.quantity_digits',\
+        '_parent_booktransf.feature', 'bookingtype')
     def on_change_with_quantity_digits(self, name=None):
         """ get digits from cashbook
         """
+        digits = 0
         if self.feature == 'asset':
             if self.cashbook:
-                return self.cashbook.quantity_digits
-        else :
-            if self.booktransf:
-                if self.booktransf.feature == 'asset':
-                    return self.booktransf.quantity_digits
-        return 4
+                digits = self.cashbook.quantity_digits \
+                    if self.cashbook.quantity_digits > digits else digits
+        else:
+            if self.bookingtype in ['mvin', 'mvout']:
+                if self.booktransf:
+                    if self.booktransf.feature == 'asset':
+                        digits = self.booktransf.quantity_digits \
+                            if self.booktransf.quantity_digits > digits \
+                            else digits
+            elif self.bookingtype in ['spin', 'spout']:
+                for spline in self.splitlines:
+                    if spline.booktransf:
+                        if spline.booktransf.feature == 'asset':
+                            digits = spline.booktransf.quantity_digits \
+                                if spline.booktransf.quantity_digits > digits \
+                                else digits
+        return digits
 
     @classmethod
     def validate(cls, lines):
@@ -649,20 +662,21 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
             # quantity must be set
             if (line.quantity is None) or \
                 (line.quantity_credit is None) or \
-                (line.quantity_debit is None):
+                    (line.quantity_debit is None):
                 raise UserError(gettext(
                     'cashbook_investment.msg_line_quantity_not_set',
-                    linetxt = line.rec_name,
+                    linetxt=line.rec_name,
                     ))
 
             # quantity and amount must with same sign
-            if (line.amount != Decimal('0.0')) and (line.quantity != Decimal('0.0')):
+            if (line.amount != Decimal('0.0')) and \
+                    (line.quantity != Decimal('0.0')):
                 (amount_sign, a_dig, a_exp) = line.amount.as_tuple()
                 (quantity_sign, q_dig, q_exp) = line.quantity.as_tuple()
                 if amount_sign != quantity_sign:
                     raise UserError(gettext(
                         'cashbook_investment.msg_line_sign_mismatch',
-                        linetxt = line.rec_name,
+                        linetxt=line.rec_name,
                         ))
 
     @classmethod
@@ -673,9 +687,10 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
 
         for line in lines:
             cnt1 = sum([1 for x in line.splitlines if x.quantity is not None])
-            quantity = sum([x.quantity or Decimal('0.0') for x in line.splitlines])
+            quantity = sum([
+                x.quantity or Decimal('0.0') for x in line.splitlines])
             if (cnt1 > 0) and (quantity != line.quantity):
-                to_write.extend([ [line], {'quantity': quantity,} ])
+                to_write.extend([[line], {'quantity': quantity, }])
         return to_write
 
     @classmethod
@@ -684,12 +699,18 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
         """
         values = super(Line, cls).add_values_from_splitlines(values)
 
-        if ('splitlines' in values.keys()) and ('quantity' not in values.keys()):
+        if ('splitlines' in values.keys()) and \
+                ('quantity' not in values.keys()):
             for action in values['splitlines']:
                 quantity = None
                 if action[0] == 'create':
-                    cnt1 = sum([1 for x in action[1] if x.get('quantity', None) is not None])
-                    quantity = sum([x.get('quantity', Decimal('0.0')) for x in action[1]])
+                    cnt1 = sum([
+                        1 for x in action[1]
+                        if x.get('quantity', None) is not None
+                        ])
+                    quantity = sum([
+                        x.get('quantity', Decimal('0.0')) for x in action[1]
+                        ])
                     if cnt1 > 0:
                         values['quantity'] = quantity
         return values
@@ -704,7 +725,9 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
         cashbook = values.get('cashbook', None)
 
         if cashbook:
-            values.update(cls.add_2nd_quantity(values, Cashbook(cashbook).quantity_uom))
+            values.update(cls.add_2nd_quantity(
+                values,
+                Cashbook(cashbook).quantity_uom))
         return values
 
 # end Line
diff --git a/tests/test_book.py b/tests/test_book.py
index 80c3bc8..cf1a17d 100644
--- a/tests/test_book.py
+++ b/tests/test_book.py
@@ -658,7 +658,7 @@ class CbInvTestCase(CashbookTestCase, InvestmentTestCase):
             }])
         self.assertEqual(books[1].lines[0].rec_name,
             '05/01/2022|Rev|1.00 usd|- [Cat1]')
-        self.assertEqual(books[1].lines[0].quantity_digits, 4)
+        self.assertEqual(books[1].lines[0].quantity_digits, 0)
 
         Book.write(*[
             [books[1]],