How to identify prorration period at rate step level

Hello to all,
I’m in a atypical situation, according to requirement when consuption cover a normal period I have to do calculation on monthly period basis but if I’m on a prorrated period like price changing or device replacement I have to do billing based on day period basis.
I’ve try using IF11, IF16 and IF17 variants but none of them do what I need.
Does anybody knows if this is posible?
Thanks in advance.

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