use relation string fields for both source & destination section in asset...
Jérome Perrin authored
use relation string fields for both source & destination section in asset price view, because we cannot define a good list field "items" method


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5917 20353a03-c40f-0410-a6d1-a30d3c3de9de
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