Number of SINGLE REGISTRATIONS in AUDYA 76 and 4

It's possible that is different the way to call the SINGLE REGISTRATIONS in AUDYA 76 and AUDYA 4?. In AUDYA 4 I have 1016 SINGLE REGISTRATIONS but if I try to call one SINGLE REGISTRATION with F2 button I only can write 3 digits (001 to 999) I think that in AUDYA 76 it's possible write 4 digits, it's true?.Thanks