Handling unit to be picked for delviery

Dear Gurus,

Our process is as follows.

We create Sales order:

Create and confirm Production Order: Make to Order scenario: Sales order stock comes to stock (Plant 0001 and str loc SL01).

We do the ad-hoc packing in HU02 and bring the Sales Order stock to Handling unit storage location (Plant 0001 and str loc SL02).

Create Delivery from the Sales Order, To be delivered from Str loc SL02.

The issue is

How the picker would know the what are the Handling unit numbers, which he can choose for the delivery.

Please suggest any reports or any other method through which picker identifies the HU numbers.

With Regards,

Malay