property_sheets: generate value accessors for source/destination accounts on default supply

Without these accessors, we have to use constructs like:

    resource.edit(
        default_purchase_supply_line_destination_account='account_module/123'
    )

with the accessors, we can use:

    resource.edit(
        default_purchase_supply_line_destination_account_value=account,
    )

The former is a bit error prone, because typos in the property name
silently create a local propery and typos in the relative URL make a
"broken" relation.

bt5/erp5_configurator_standard/TestTemplateItem/portal_components/test.erp5.testStandardConfigurationWorkflow.py

@@ -1045,7 +1045,7 @@ class StandardConfigurationMixin(TestLiveConfiguratorWorkflowMixin):
         individual_variation_base_category='variation',
         base_contribution='base_amount/taxable',
         default_sale_supply_line_base_price=10,
-        default_sale_supply_line_source_account=sales_account.getRelativeUrl(),
+        default_sale_supply_line_source_account_value=sales_account,
     )
     portal.portal_workflow.doActionFor(resource, 'validate_action')
     self.tic()
@@ -1053,7 +1053,7 @@ class StandardConfigurationMixin(TestLiveConfiguratorWorkflowMixin):
         portal_type='Service',
         title="VAT",
         use_value=self.portal.portal_categories.use.trade.tax,
-        default_sale_supply_line_source_account=vat_account.getRelativeUrl(),
+        default_sale_supply_line_source_account_value=vat_account,
     )
     portal.portal_workflow.doActionFor(vat_service, 'validate_action')
 
@@ -1483,7 +1483,7 @@ class StandardConfigurationMixin(TestLiveConfiguratorWorkflowMixin):
         individual_variation_base_category='variation',
         base_contribution='base_amount/taxable',
         default_purchase_supply_line_base_price=10,
-        default_purchase_supply_line_destination_account=expense_account.getRelativeUrl(),
+        default_purchase_supply_line_destination_account_value=expense_account,
     )
     portal.portal_workflow.doActionFor(resource, 'validate_action')
     self.tic()
@@ -1491,7 +1491,7 @@ class StandardConfigurationMixin(TestLiveConfiguratorWorkflowMixin):
         portal_type='Service',
         title="VAT",
         use_value=self.portal.portal_categories.use.trade.tax,
-        default_purchase_supply_line_destination_account=vat_account.getRelativeUrl(),
+        default_purchase_supply_line_destination_account_value=vat_account,
     )
     portal.portal_workflow.doActionFor(vat_service, 'validate_action')
 

product/ERP5/bootstrap/erp5_property_sheets/PropertySheetTemplateItem/portal_property_sheets/DefaultSupply/internal_supply_line_property.xml

@@ -83,6 +83,7 @@
                 <string>destination_reference</string>
                 <string>p_variation_base_category_list</string>
                 <string>destination_account</string>
+                <string>destination_account_value</string>
                 <string>destination_function</string>
                 <string>destination_function_value</string>
                 <string>destination_function_value_list</string>
@@ -92,6 +93,7 @@
                 <string>destination_funding_value_list</string>
                 <string>destination_funding_title</string>
                 <string>source_account</string>
+                <string>source_account_value</string>
                 <string>source_function</string>
                 <string>source_function_title</string>
                 <string>source_function_value</string>

product/ERP5/bootstrap/erp5_property_sheets/PropertySheetTemplateItem/portal_property_sheets/DefaultSupply/purchase_supply_line_property.xml

@@ -83,6 +83,7 @@
                 <string>destination_reference</string>
                 <string>p_variation_base_category_list</string>
                 <string>destination_account</string>
+                <string>destination_account_value</string>
                 <string>destination_function</string>
                 <string>destination_function_value</string>
                 <string>destination_function_value_list</string>

product/ERP5/bootstrap/erp5_property_sheets/PropertySheetTemplateItem/portal_property_sheets/DefaultSupply/sale_supply_line_property.xml

@@ -83,6 +83,7 @@
                 <string>destination_reference</string>
                 <string>p_variation_base_category_list</string>
                 <string>source_account</string>
+                <string>source_account_value</string>
                 <string>source_function</string>
                 <string>source_function_value</string>
                 <string>source_function_value_list</string>