ANSWER:

The Messenger of Allaah (peace and blessings of Allaah be upon him) cursed the one who consumes riba and the one who pays it, the one who writes it down and the two who witness it, and he said: they are all the same. Narrated by Muslim (1598). 

You have done your job by advising him against it.

https://islamqa.info/en/answers/103181/ruling-on-studying-accountancy-and-working-as-an-accountant-in-various-companies-and-organizations

https://islamqa.info/en/answers/112175/ruling-on-working-as-an-accountant-in-companies-institutions-and-factories

 

Shykh I told one of my friends that recording interest based transaction as a chartered accountant is haram providing reference u gave me..but he tells me that how accounts department can run without chartered accountant if recording interest based transaction haram because every thing is riba based..how can I give answer or understand him?