accounting: fix wrong mirror node displayed in grouping dialog

When account number method is set to account reference and the
transaction line has a node acquired from the invoice source or
destination organisation or person and when this node has a reference,
then this was displayed as an account reference.

We set a reference on Client 1 organisation to reproduce the problem.

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/Brain_getMirrorNodeFormattedTitle.py

 mirror_node_formatted_title = ''
 if context.mirror_node_uid:
-  brain_list = context.getPortalObject().portal_catalog(uid=context.mirror_node_uid, limit=2)
+  brain_list = context.getPortalObject().portal_catalog(
+    uid=context.mirror_node_uid,
+    portal_type='Account',
+    limit=2,
+  )
   if brain_list:
     brain, = brain_list
     mirror_node_formatted_title = brain.getObject().Account_getFormattedTitle()

bt5/erp5_accounting_ui_test/PathTemplateItem/organisation_module/client_1.xml

@@ -80,6 +80,10 @@
               </tuple>
             </value>
         </item>
+        <item>
+            <key> <string>default_reference</string> </key>
+            <value> <string>O-CLI1</string> </value>
+        </item>
         <item>
             <key> <string>description</string> </key>
             <value>

bt5/erp5_accounting_ui_test/PathTemplateItem/portal_tests/accounting_zuite/test_grouping_reference/test_group_dialog_show_mirror_account.html.zpt

@@ -123,6 +123,71 @@ Grouping Dialog show mirror account
   <td>7 - Goods Sales</td>
 </tr>
 
+<!-- This also works when using "Account Reference" for account number method -->
+<tr>
+  <td>open</td>
+  <td>${base_url}/PreferenceTool_setAccountingTestAccountReferencePreference</td>
+  <td></td>
+</tr>
+<tr>
+  <td>verifyTextPresent</td>
+  <td>Preference Set</td>
+  <td></td>
+</tr>
+<tr>
+  <td>open</td>
+  <td>${base_url}</td>
+  <td></td>
+</tr>
+<tr>
+  <td>selectAndWait</td>
+  <td>select_module</td>
+  <td>Organisations</td>
+</tr>
+<tr>
+  <td>clickAndWait</td>
+  <td>Folder_show:method</td>
+  <td></td>
+</tr>
+<tr>
+  <td>type</td>
+  <!-- title -->
+  <td>//tr[@class='listbox-search-line']/th[2]/input</td>
+  <td>Client 1</td>
+</tr>
+<tr>
+  <td>clickAndWait</td>
+  <td>//input[@class="listbox-select-action"]</td>
+  <td></td>
+</tr>
+
+<tr>
+  <td>clickAndWait</td>
+  <td>link=Client 1</td>
+  <td></td>
+</tr>
+<tr>
+  <td>clickAndWait</td>
+  <td>//img[@alt='Grouping Reference Fast Input']</td>
+  <td></td>
+</tr>
+
+<tr>
+  <td>verifySelected</td>
+  <td>field_your_node</td>
+  <td>label=A-REC - Receivable</td>
+</tr>
+<tr>
+  <td>assertText</td>
+  <td>//tr[@class='listbox-data-line-0 DataA']/td[11]</td>
+  <td></td>
+</tr>
+<tr>
+  <td>assertText</td>
+  <td>//tr[@class='listbox-data-line-1 DataB']/td[11]</td>
+  <td>A-PAY - Payable</td>
+</tr>
+
 </tbody></table>
 </body>
 </html>
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