Document Routing Layout Design

Hi All,

I am able to print the Label  of License Plate through the ZPL Printer after the work completed through the mobile APP.

I have taken the Document routing layout code from some blog,now i need to add some extra field in layout .

I have tried to add some extra field basis of  available code after adding code its not printing the label.

Could you please suggest  how we can design the layout or printer vendor will provide the code basis of fields we required.

Thank you so much  for your reply!!!!!!