errand_date must be handled through a generic "Commission" subobject which is capable of accounting commissions for multiple parties if necessary. receiced_date and emit_date should be handled through CRM Event objects.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19000 20353a03-c40f-0410-a6d1-a30d3c3de9de