please can someone tell me what the equivalent of the dax query-->MDX
calculate( sum([Measures].[Poids Total]) ,ALL([Dim1].[Id Df])))
At its simplest in MDX it might just be a tuple of the measure and the ALL member of the respective hierarchy:
(
[Measures].[Poids Total],
[Dim1].[Id Df].[Id Df].[All]
)