acquisition, so we simply call getSourcePaymentValue() and check the portal
type of this value.
Also, if no title is set for an external payment, use the third party title.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13284 20353a03-c40f-0410-a6d1-a30d3c3de9de