MODEL PART NUMBER IN DRAWING

Hello,

I am having some issues with \$PRP codes that I am hoping someone can assist with.

We typically change the configuration name to match our part number for a custom part.  This Configuration name resolves to the SW-Part Number and SW-PartNo via custom properties at the part level.

In the drawing, I can access the "Part Number (BOM)" from the drawing balloon and the part number from this field (at the part level) will populate to the drawing level.

I want this same number to auto-fill in the custom properties field for "Drawing Number" and no combination of code seems to work for me.  "D-" is our drawing designation.  D-[ Part Number]

D-"SW-Part No"

D-\$PRP:"SW-Part Number"

D-\$PRPSHEET...

D-\$PRPMODEL...

Nothing works.

What am I missing?

SolidworksDrawings And Detailing