We can take a shortcut.
portal_contribution.newContent(portal_type, container) will be an 
alias of container.newContent(portal_type) with starting of Metadata Discovery
process.

Done by JPS


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41716 20353a03-c40f-0410-a6d1-a30d3c3de9de