I have a model 'purchase_approval_item' with an invoice_id
multiple people approve the invoice and they are registered in the model 'purchase_approval_item_line'
Now i need to show the 'purchase_approval_item' in a tree view, but filter is for the logged in user.
I want to add one2many field in 'purchase_approval_item', approved_by_ids which should be the uids of the approvers. And i want to use that one2many field to filter the treeview.
How can i do this with the openerp framework?