delete account / identity with STRAPS

Hello,
I am using SRAPS for provisioning phones. Beautiful! I have a question, though, if I create new identities from the SRAPS system, the phone synchronizes correctly. If I delete an identity from SRAPS, the phone does not update, and the deleted identity remains on the phone. I am doing something wrong, or it is correct that it is impossible to delete identity, but why?
Thank you so much