def METHOD_NAME(self):
    """Purge tracking for each picking and destination package"""
    for batch in self:
        move_lines = batch.move_line_ids
        packs = move_lines.result_package_id.filtered(lambda p: p.parcel_tracking)
        if packs:
            packs.write({"parcel_tracking": False})
        pickings = self.env["stock.picking"].search(
            [
                ("move_line_ids", "in", move_lines.ids),
                ("carrier_tracking_ref", "!=", False),
            ]
        )
        if pickings:
            pickings.write({"carrier_tracking_ref": False})