If we configure it like following values:

* Name = Picking Batch Report
* Model = Transfer
* Template Name = my.picking_batch_report
* Add subreport = Delivery Slip and Picking Operations
* Save it.

To get results:

* Go to Inventory > Operations > Transfers
* Open one record or select multi records.
* Click on "Print" option near by "Action".
* Print "Picking Batch Report"
* We will get delivery slip and picking operations report together.