How to Implement Custom Numbering Sequence in Custom Processing Screen

Hello Community,

I have a Custom Processing Screen, the sole purpose of which is to assign a BOL Number (a Non-Key Field) to any Sales Order Shipments without a BOL Number:

I’m trying to do so by utilizing a Numbering Sequence that I have tied to the Sales Order Preference screen:

The Problem: when I use my custom Assign BOL Number processing screen, it doesn’t assign the Last Number -- it assigns the Numbering Sequence Symbol (<NEW>).

I have tried so many alternate ways based on other Community posts -- even my own attempts (I.E. [AutoNumber(typeof(SOSetupExt.usrcbolno), typeof(NumberingSequence.lastNbr))] ) but it keeps pulling the Numbering Sequence’s Symbol -- not the Last Number.

How can I utilize my Numbering Sequence for my Custom Processing Screen?

Any and all help is much appreciated!