I'm a bit perplexed but I’m sure someone can assist. 

We are using model-driven drawings, where part number, title and drawn by are pulled from the model into the title block. The model values are populated in PTB. All this works well. 

In the drawing custom props, the part number and title field are not pulling in from the model custom props, so I can't map them to the PTB. In the drawing PTB, they