slapos_accounting: improve Payment line title

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_accounting/Entity_createPaymentTransaction.py

@@ -74,6 +74,7 @@ for index, line in enumerate(invoice_list):
   if line.total_price:
     payment_transaction.newContent(
       id="receivable%s" % index,
+      title="receivable%s - %s" % (index, line.getSourceReference()),
       portal_type='Accounting Transaction Line',
       source=line.node_relative_url,
       destination_value=getAccountForUse('payable'),