I am making some changes on a specific module that raises an error when added to a recent addons package. The code works fine for a previous version of some addons, but when I add this module to a update list of addons I get an execution error and I get stuck on this problem.

The error is:

ValueError: Invalid field 'discharge_id' in leaf "<osv.ExtendedLeaf: ('discharge_id', 'in', [18]) on stock_picking (ctx: )>"

I believe if I put some parts of the code you can help me solve this.

The class for the main form:

class discharge_note(osv.osv):
    _name = 'discharge.note'
    _description = 'Discharge Note'
    _inherit = 'mail.thread'
    _columns = {
                'name': fields.char('Reference', size=32, states={'confirmed': [('readonly', True)], 'done': [('readonly', True)]}),
                'date': fields.datetime('Discharge Date'),
                'user_id': fields.many2one('res.users', 'Responsible', states={'confirmed': [('readonly', True)], 'done': [('readonly', True)]}),
                'description': fields.text('Description',),
                'company_id': fields.many2one('res.company', 'Company', required=True),
                'line_ids' : fields.one2many('discharge.note.line', 'discharge_id', 'Products to Discharge'),
                'warehouse_id': fields.many2one('stock.warehouse', 'Warehouse', states={'confirmed': [('readonly', True)], 'done': [('readonly', True)]}),
                'location_id': fields.related('warehouse_id', 'disc_local_id', type='many2one', relation='stock.location', string='Warehouse Location', store=True, readonly=True),
                'state': fields.selection([('draft','New'),('confirmed','Waiting Availability'),('done','Delivery Done')], 'Status', track_visibility='onchange', required=True),
                'ship_id': fields.many2one('ship', 'Ship'),
                'picking_in_ids' : fields.one2many('stock.picking.in','discharge_id','Delivery Orders',),
                'notes' : fields.char('Notes', size=255)
    }

The class for the lines on document:

class discharge_note_line(osv.osv):
    _name = "discharge.note.line"
    _description="Stock Discharge Line"
    _rec_name = 'product_id'

    _columns = {
        'product_id': fields.many2one('product.product', 'Product' ),
        'product_uom_id': fields.many2one('product.uom', 'Product Unit of Measure'),
        'product_qty': fields.float('Quantity', digits_compute=dp.get_precision('Product Unit of Measure')),
        'discharge_id' : fields.many2one('discharge.note', 'Discharge Note', ondelete='cascade'),
        'company_id': fields.related('discharge_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True, readonly=True),
    }

The stock.picking and stock_picking_in classes:

class stock_picking(osv.osv):
    _name = "stock.picking"
    _inherit = "stock.picking"

    def do_partial(self, cr, uid, ids, partial_data, context=None):
        picking_in_obj = self.pool.get('stock.picking.in')
        res = super(stock_picking, self).do_partial(cr, uid, ids, partial_data, context=context)
        note_ids = set()
        ids = picking_in_obj.search(cr, uid, [('type', '=', 'in'), ('id', 'in', ids)])
        for picking in picking_in_obj.browse(cr, uid, ids):
            if picking.discharge_note_id:
                note_ids.add(picking.discharge_note_id.id)
        if note_ids:
            self.pool.get('discharge.note').write(cr, uid, note_ids, {'state': 'done'}, context)
        return res


class stock_picking_in(osv.osv):
    _name = "stock.picking.in"
    _inherit = "stock.picking.in"

    _columns = {
                'discharge_note_id' : fields.many2one('discharge.note', 'Discharge Note'),
                }

I believe all code runs from here (method set_status_done):

   def set_status_done(self, cr, uid, ids, context=None):
        picking_in_obj = self.pool.get('stock.picking.in')
        partial_picking_obj = self.pool.get('stock.partial.picking')
        for note in self.browse(cr, uid, ids, context):
            picking_in_ids = [picking.id for picking in note.picking_in_ids]
            picking_in_obj.draft_validate(cr, uid, picking_in_ids, context=context)
            # draft_validate sets the context for creating a partial picking
            partial_fields = ('picking_id', 'move_ids', 'date')
            partial_values = partial_picking_obj.default_get(cr, uid, partial_fields, context)
            partial_values['move_ids'] = [(0, 0, v) for v in partial_values['move_ids']]
            partial_id = partial_picking_obj.create(cr, uid, partial_values, context)
            partial_picking_obj.do_partial(cr, uid, [partial_id], context)
        return self.write(cr, uid, ids, {'state': 'done'})

Anyone can help me please?

Thank you very much