Nested Ago and Todate function problem

Hi,
in my rpd i have following Time hierarchy:
Year
Quarter
Month
and a fact table Fact Shop which contains Monthly measure "Number of Hearing Aids Delivered".
I must calculate PY_QTD, PY_YTD versions of above measure.
I have tried to use built-in Time Functions Ago and ToDate in the following way:
PY_QTD
Todate(Ago("Number of Hearing Aids Delivered",1,"Time.Year"), "Time.Quarter")
PY_YTD
Todate(Ago("Number of Hearing Aids Delivered",1,"Time.Year"), "Time.Year")
but when i check consistency i have error which says approximately "You can nest Ago and ToDate functions".
There's another way, to calculate it? Can you help?
Thanks
Giancarlo

So u r referring PY as previous year ;)
Here u go;
it’s a combination of AGO and TODATE.
You create a value – let’s say Sales MTD by just following normal process…then you create a logical column with the following formula AGO (Sales MTD, Month Dim, 12)
that should give you a MTD measure you’re looking for. I hope this is useful. Just dont use both function in single logical column....use seperate by first creating YTD n then AGO function to create previous year data.
For ur case use to calculate PY_YTD use below:
Create logical column
Aids Delivered YTD with formula as TODATE("Number of Hearing Aids Delivered"), "Time.Year")
and then create another logical column as
Aids Delivered PY_YTD with formula as AGO("Aids Delivered YTD","Time.Year",1)
This will work for sure....

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