Translate Trailing 12 Months CalcScript to MDX

Hello

Hello experts, I have to create some new periods (dynamic calcs) in PBCS application to calc Last twelve months and I have to do with calc script and MDX (ASO cube)

These codes that I'll show you are working but I would like to know if I can optimize ASO code:

I have to apply just in some group of dimension accounts (Net Profit and Balance)

Example with February:

Calc Script:

Feb_LTM:

IF (@ISMBR(@IDESCENDANTS("Net Profit")) OR @ISMBR(@IDESCENDANTS("BALANCE")))
@SUM("Jan":"Feb")+@SUMRANGE(@MEMBER(@PREVSIBLING(@CURRMBR("Year"))),"Mar":"Dec");
ENDIF

MDX:

Feb_LTM:

CASE
WHEN IsAncestor ([Net Profit], [Account].currentmember, includemember) or IsAncestor ([BALANCE], [Account].currentmember, includemember)