erp5_accounting: custom for grouping transactions

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransactionLine_getGroupingExtraParameterList.py

-"""This script is a placeholder for projects to implement extra constraint to prevent grouping of accounting transaction lines.
-Note that the sequence of letters will still remain unique for section, mirror_section and node, regardless of extra grouping parameters.
-
-For instance, we can refuse to group together lines for different order by returning the reference of the order in that script.
-
-The returned value must be hashable.
-"""
-
-# By default we take into account ledger and mirror accounting.
-
-# We consider ledger so that, by default we don't group lines from different ledger.
-# This may be customized too, depending on how ledgers are used in customized implementations.
-
-# We consider mirror accounting because that when using internal accounting transaction between
-# two entities of the group, the grouping has to be valid for both sides
-# (source_section & destination_section).
-# This behavior was introduced in nexedi/erp5@f3bebea3 for compatibility,
-# some old sites where accounting lines have been grouped together regardless of
-# the mirror node can decide to ignore the mirror account.
-# Maybe to ignore mirror account for transactions created before the date they
-# deployed this new versions.
-# This can be achieved easily by customizing this script.
-
-if source:
-  return context.getLedger(), context.getSource(portal_type='Account')
-return context.getLedger(), context.getDestination(portal_type='Account')
+# custom: we do not care about mirror account