As part of the Purchase Order / Goods In process, you can view all Customer Orders and print an A4 receipt to attach to items when putting to one side.
Within each Purchase Order the button is seen alongside the standard function buttons:
Clicking this will open a new window showing all applicable Customer Orders:
From here you can click the customer name and open the customer card, click 'Contact' and open the communication module to send them an SMS or email, open the customers order in POS or click 'Open A4 Order receipt' and print a copy of the A4 receipt to attach to the item.