Index: trytond/trytond/modules/account_invoice/invoice.py
===================================================================

--- a/trytond/trytond/modules/account_invoice/invoice.py
+++ b/trytond/trytond/modules/account_invoice/invoice.py
@@ -19,6 +19,8 @@
 from trytond.transaction import Transaction
 from trytond.pool import Pool
 from trytond.rpc import RPC
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Invoice', 'InvoicePaymentLine', 'InvoiceLine',
     'InvoiceLineTax', 'InvoiceTax',
@@ -1541,7 +1543,7 @@
             'required': Eval('type') == 'line',
             },
         depends=['type', 'invoice_type'])
-    unit_price = fields.Numeric('Unit Price', digits=(16, 4),
+    unit_price = fields.Numeric('Unit Price', digits=(16, DIGITS),
         states={
             'invisible': Eval('type') != 'line',
             'required': Eval('type') == 'line',

Index: trytond/trytond/modules/product/product.py
===================================================================

--- a/trytond/trytond/modules/product/product.py
+++ b/trytond/trytond/modules/product/product.py
@@ -6,6 +6,8 @@
 from trytond.pool import Pool
 from trytond import backend
 from trytond.const import OPERATORS
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Template', 'Product']

@@ -36,9 +38,9 @@
     category = fields.Many2One('product.category', 'Category',
         states=STATES, depends=DEPENDS)
     list_price = fields.Property(fields.Numeric('List Price', states=STATES,
-            digits=(16, 4), depends=DEPENDS, required=True))
+            digits=(16, DIGITS), depends=DEPENDS, required=True))
     cost_price = fields.Property(fields.Numeric('Cost Price',
-            states=STATES, digits=(16, 4), depends=DEPENDS, required=True))
+            states=STATES, digits=(16, DIGITS), depends=DEPENDS, required=True))
     cost_price_method = fields.Property(fields.Selection([
                 ("fixed", "Fixed"),
                 ("average", "Average")
@@ -131,9 +133,9 @@
             on_change_with=['template']),
         'on_change_with_type', searcher='search_type')
     list_price_uom = fields.Function(fields.Numeric('List Price',
-        digits=(16, 4)), 'get_price_uom')
+        digits=(16, DIGITS)), 'get_price_uom')
     cost_price_uom = fields.Function(fields.Numeric('Cost Price',
-        digits=(16, 4)), 'get_price_uom')
+        digits=(16, DIGITS)), 'get_price_uom')

     @classmethod
     def order_rec_name(cls, tables):

Index: trytond/trytond/modules/production/production.py
===================================================================

--- a/trytond/trytond/modules/production/production.py
+++ b/trytond/trytond/modules/production/production.py
@@ -7,6 +7,8 @@
 from trytond.pyson import Eval, Bool, If, Id
 from trytond.pool import Pool
 from trytond.transaction import Transaction
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Production', 'AssignFailed', 'Assign']

@@ -98,7 +100,7 @@
             'invisible': ~Eval('product'),
             },
         depends=['unit_digits'])
-    cost = fields.Function(fields.Numeric('Cost', digits=(16, 4),
+    cost = fields.Function(fields.Numeric('Cost', digits=(16, DIGITS),
             readonly=True), 'get_cost')
     inputs = fields.One2Many('stock.move', 'production_input', 'Inputs',
         domain=[

Index: trytond/trytond/modules/purchase/product.py
===================================================================

--- a/trytond/trytond/modules/purchase/product.py
+++ b/trytond/trytond/modules/purchase/product.py
@@ -9,6 +9,8 @@
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
 from trytond import backend
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Template', 'Product', 'ProductSupplier', 'ProductSupplierPrice']
 __metaclass__ = PoolMeta
@@ -264,7 +266,8 @@
     product_supplier = fields.Many2One('purchase.product_supplier',
             'Supplier', required=True, ondelete='CASCADE')
     quantity = fields.Float('Quantity', required=True, help='Minimal quantity')
-    unit_price = fields.Numeric('Unit Price', required=True, digits=(16, 4))
+    unit_price = fields.Numeric('Unit Price', required=True, digits=(16,
+            DIGITS))
     sequence = fields.Integer('Sequence')

     @classmethod

Index: trytond/trytond/modules/purchase/purchase.py
===================================================================

--- a/trytond/trytond/modules/purchase/purchase.py
+++ b/trytond/trytond/modules/purchase/purchase.py
@@ -15,6 +15,8 @@
 from trytond.pyson import Eval, Bool, If, PYSONEncoder, Id
 from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Purchase', 'PurchaseInvoice', 'PurchaseIgnoredInvoice',
     'PurchaseRecreadtedInvoice', 'PurchaseLine', 'PurchaseLineTax',
@@ -870,7 +872,7 @@
         fields.Many2One('product.uom.category', 'Product Uom Category',
             on_change_with=['product']),
         'on_change_with_product_uom_category')
-    unit_price = fields.Numeric('Unit Price', digits=(16, 4),
+    unit_price = fields.Numeric('Unit Price', digits=(16, DIGITS),
         states={
             'invisible': Eval('type') != 'line',
             'required': Eval('type') == 'line',

Index: trytond/trytond/modules/purchase/stock.py
===================================================================

--- a/trytond/trytond/modules/purchase/stock.py
+++ b/trytond/trytond/modules/purchase/stock.py
@@ -10,6 +10,8 @@
 from trytond.transaction import Transaction
 from trytond.pyson import PYSONDecoder, PYSONEncoder
 from trytond import backend
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['ShipmentIn', 'ShipmentInReturn', 'Move',
     'OpenProductQuantitiesByWarehouse']
@@ -152,7 +154,7 @@
     purchase_unit_digits = fields.Function(fields.Integer(
         'Purchase Unit Digits'), 'get_purchase_fields')
     purchase_unit_price = fields.Function(fields.Numeric('Purchase Unit Price',
-            digits=(16, 4), states={
+            digits=(16, DIGITS), states={
                 'invisible': ~Eval('purchase_visible', False),
                 }, depends=['purchase_visible']), 'get_purchase_fields')
     purchase_currency = fields.Function(fields.Many2One('currency.currency',

Index: trytond/trytond/modules/sale/sale.py
===================================================================

--- a/trytond/trytond/modules/sale/sale.py
+++ b/trytond/trytond/modules/sale/sale.py
@@ -15,6 +15,8 @@
 from trytond.pyson import If, Eval, Bool, PYSONEncoder, Id
 from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['Sale', 'SaleInvoice', 'SaleIgnoredInvoice', 'SaleRecreatedInvoice',
     'SaleLine', 'SaleLineTax', 'SaleLineIgnoredMove',
@@ -979,7 +981,7 @@
         fields.Many2One('product.uom.category', 'Product Uom Category',
             on_change_with=['product']),
         'on_change_with_product_uom_category')
-    unit_price = fields.Numeric('Unit Price', digits=(16, 4),
+    unit_price = fields.Numeric('Unit Price', digits=(16, DIGITS),
         states={
             'invisible': Eval('type') != 'line',
             'required': Eval('type') == 'line',

Index: trytond/trytond/modules/stock/move.py
===================================================================

--- a/trytond/trytond/modules/stock/move.py
+++ b/trytond/trytond/modules/stock/move.py
@@ -12,6 +12,8 @@
 from trytond.pyson import In, Eval, Not, Equal, If, Get, Bool
 from trytond.transaction import Transaction
 from trytond.pool import Pool
+from trytond.config import config
+DIGITS = config.getint('digits', 'unit_price_digits', 4)

 __all__ = ['StockMixin', 'Move']

@@ -197,14 +199,15 @@
                 Eval('context', {}).get('company', -1)),
             ],
         depends=['state'])
-    unit_price = fields.Numeric('Unit Price', digits=(16, 4),
+    unit_price = fields.Numeric('Unit Price', digits=(16, DIGITS),
         states={
             'invisible': Not(Bool(Eval('unit_price_required'))),
             'required': Bool(Eval('unit_price_required')),
             'readonly': Not(Equal(Eval('state'), 'draft')),
             },
         depends=['unit_price_required', 'state'])
-    cost_price = fields.Numeric('Cost Price', digits=(16, 4), readonly=True)
+    cost_price = fields.Numeric('Cost Price', digits=(16, DIGITS),
+        readonly=True)
     currency = fields.Many2One('currency.currency', 'Currency',
         states={
             'invisible': Not(Bool(Eval('unit_price_required'))),