Adding Customer number to sales order (retail manager V12)

Hi everyone,

I'm having real problems figuring out how to get help for Retail Manager V12 so apologies if this is in the wrong area.

I've noticed that our businesses sales orders display the customer's number as well as their other details when printed on docket printer mode, but when I put the sales order onto A4 paper, the customer number is no longer there. Does anyone know how to add the customer number to A4 sales order receipts? 

Thanks!