It's not something I bother ed about while in my IVA, I could see that there were some defaulting, some partially settled and others who just showed everything was OK! Until the last throws of your IVA I just wouldn't even bother with how they report as you are shot for credit until the IVA is over, you are in possession of your completion certificate and have then demonstrated a good credit history.
Last Payment made 04/12/14. Completion Certificate 25/7/15. IVA company GT. No Issues