Calculate Cumulative Month Value in MDX - ssas

Question

I wanna calculate the cumulative values by month/year
My dimensions period as follow:
Period Dimension
I ve tried any ways to perform this operation, but unsucessfull
with member [Measures].[Valor Acumulado]
as Sum(PeriodsToDate([Período].[Mês].[(All)]),[Measures].[Valor Pago]
)
with member
[Measures].[Valor Acumulado] as Sum(YTD([Período].[Mês].[(All)]),
[Measures].[Valor Pago])
Or the cumulative calcule does not work or appears a Error Message
CellOrdinal 1
VALUE #Error Query (2, 37)
The YTD function expects a member expression for the argument. A string or numeric expression was used
Query execution
Query execution
Is it necessary to make a concatenation with Year and Month members?
Anybody to help me?

Answer 1

Take a look at the sample below, it will help.
with
member
[Measures].[Internet Sales AmountRunningtotal]
as
case when [Measures].[Internet Sales Amount] = null then null
else
sum({[Product].[Subcategory].firstchild:[Product].[Subcategory].currentmember},[Measures].[Internet Sales Amount])
end
select {[Measures].[Internet Sales Amount],
[Measures].[Internet Sales AmountRunningtotal]
} on columns,
non empty
([Date].[Calendar Year].[Calendar Year],[Date].[Calendar Quarter of Year].[Calendar Quarter of Year],
[Product].[Category].[Category],[Product].[Subcategory].[Subcategory])
on
rows
from
[Adventure Works]
Result

Answer 2

Well, i made this sugessted changes, but the result was the same as
Query Execution
with member [Measures].[Valor Acumulado] as Sum({[Período].[Mês].firstchild
[Período].[Mês].currentmember},[Measures].[Valor Pago])
SELECT NON EMPTY { [Measures].[Valor Pago], [Measures].[Valor Acumulado] } ON COLUMNS,
NON EMPTY { ([Grupo de Despesa].[Grupo de Despesa].[Grupo de Despesa].ALLMEMBERS,
[Período].[Ano].[Ano].ALLMEMBERS * [Período].[Mês].[Mês].ALLMEMBERS,
[Período].[Nome de Mês].[Nome de Mês].ALLMEMBERS )
}ON ROWS
FROM (
SELECT ( -{ [Unidade Governamental].[Sigla Orgão].&[ALESE],
[Unidade Governamental].[Sigla Orgão].&[DPE],
[Unidade Governamental].[Sigla Orgão].&[FAI],
[Unidade Governamental].[Sigla Orgão].&[FUNDECON],
[Unidade Governamental].[Sigla Orgão].&[MPE],
[Unidade Governamental].[Sigla Orgão].&[RC],
[Unidade Governamental].[Sigla Orgão].&[TJ],
[Unidade Governamental].[Sigla Orgão].&[TCE] } ) ON COLUMNS
from [Execução Orçamentária])