I am assuming that the cube is three dimensional and the dimensions in the cube are
- IR FI
- IR Universe
- IR FI Universe Mapping Measure
([IR Universe].[RU], [IR FI Universe Mapping Measure].[Until Serial]) = 0
I understand that the code snipplet is part of a Filter operation, such as:
FITLER ( TM1SubsetAll([IR FI]), [IR FI Universe Mapping].([IR Universe].[RU], [IR FI Universe Mapping Measure].[Until Serial]) = 0)
So in this case the [cube].(element1, element2, ...) statements is a lookup and evaluates to either a numeric or a string value, depending on the cell.
So in fact you are not comparing a tuple to anything. The tuple is just part of the look-up in the Filter statement.
Hope it helps.