Then the auditor should ask you to prove it another way. You may think you hoodwinked them, but don't be so sure that they didn't build their own model to chec

Then the auditor should ask you to prove it another way. You may think you hoodwinked them, but don't be so sure that they didn't build their own model to check your work... They do this all the time when people say 'I don't know how it works, the ERP calculates it.'