Re-order Hanset

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Hi,

I was experiencing a problem due to Hanset register order. We use autoprovisioning to configure user accounts and set it to one handset.
We do like the following:
Account 1 -> H1
Account2 -> H2
.
.

This works fine until we need to deregister one of the handsets.
E.g. One client has 4 handsets each one with one account if I delete H2 I will configure Account1 to 3 but with our autoprovision one of the accounts will be unavailable because Account3 -> H3 that does not exist.
I tried factory reset on both base and handset but without success, H4 is allways H4. Is there any way to change this?

Best Regards