Product reference code missing in order

[origrafica]

Scene:

Prestashop 1.7.6.7, e-commerce site taken offline two months after launch because the owner died.
After two/three years the children want to start again with the family business.

Now the customer complains that he loaded all the items with their respective reference codes which follow the warehouse coding but in ervery order location, backend, mail, pdf generated, reference code is missing.

I ask myself about reference code function if this isn't  displayed in order.

Now I ask you experts if there is a way to view reference code in generated order and in the emails sent by the system.

 

Thank you

Edited October 26, 2023 by origrafica (see edit history)