invoicing: Only set original invoice as causality.

bt5/erp5_invoicing/SkinTemplateItem/portal_skins/erp5_invoicing/Invoice_createCreditNoteInvoice.xml

@@ -86,7 +86,7 @@ reverse_invoice = context.getParentValue().newContent(\n
 )\n
 # Separate edit to have stable outcome WRT category_list\n
 reverse_invoice.edit(\n
-  causality_value_list=context.getCausalityValueList() + [context],\n
+  causality_value=context,\n
   specialise_list=context.getSpecialiseList(),\n
   price_currency_list=context.getPriceCurrencyList(),\n
   resource_list=context.getResourceList(),\n

bt5/erp5_invoicing/bt/revision

-392
+393
\ No newline at end of file