accounting: define a getPreferredAttachedDocumentGroup script

The default group of documents attached to accounting transactions can be
taken from the group of sections

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransaction_getPreferredAttachedDocumentGroup.py

+if context.AccountingTransaction_isSourceView():
+  section_list = [
+      context.getSourceSectionValue(portal_type='Organisation'),
+      context.getDestinationSectionValue(portal_type='Organisation'),
+  ]
+else:
+  section_list = [
+      context.getDestinationSectionValue(portal_type='Organisation'),
+      context.getSourceSectionValue(portal_type='Organisation'),
+  ]
+
+for section in section_list:
+  if section is not None:
+    if section.getGroup():
+      return section.getGroup()
+
+return context.Base_getPreferredAttachedDocumentGroup()

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransaction_getPreferredAttachedDocumentGroup.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="PythonScript" module="Products.PythonScripts.PythonScript"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>Script_magic</string> </key>
+            <value> <int>3</int> </value>
+        </item>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary>
+                            <item>
+                                <key> <string>name_container</string> </key>
+                                <value> <string>container</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_context</string> </key>
+                                <value> <string>context</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_m_self</string> </key>
+                                <value> <string>script</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_subpath</string> </key>
+                                <value> <string>traverse_subpath</string> </value>
+                            </item>
+                          </dictionary>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_params</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>AccountingTransaction_getPreferredAttachedDocumentGroup</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>