accounting: do not show my_ledger field if no ledger defined on this type

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransaction_viewFieldLibrary/my_ledger.xml

@@ -10,6 +10,7 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
+                <string>enabled</string>
                 <string>items</string>
                 <string>title</string>
               </list>
@@ -53,6 +54,12 @@
             <key> <string>tales</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value>
+                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+                    </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string></string> </value>
@@ -64,7 +71,7 @@
                 <item>
                     <key> <string>items</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -82,6 +89,10 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value> <int>1</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_view_mode_category</string> </value>
@@ -111,6 +122,19 @@
     </pickle>
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_text</string> </key>
+            <value> <string>python: here.portal_types[here.getPortalType()].getLedger()</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="3" aka="AAAAAAAAAAM=">
     <pickle>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>