Invoice or document generation for my custom app in app engine studio

[AyeshaF]

Hi, 

I built a custom app from the app engine studio WEBATS, regarding fabric production and supply to the customers. 

I created the tables for it, and everything went smoothly. However, the main challenge is to generate the invoice and report pdfs for this particular application. I have created the table for invoices, and I want to generate the pdf for that specific form including the fields what are there in the table. 

I want to add all these fields in the pdf when I generate the document from this table. 

Is there any possible way to do it, I checked it and tried from the document template creation but it's not showing up. I am really stuck now on this.