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It would be nice if you could add a preset data formatting feature. This is missing in both Multidimensional and Tabular side of development. We can let the users define a set of format which they want to use in the project. And whenever they define the measure they can attach the preset format to the measure. Again leaving the fields you already have for formatting there so we can override the preset if we wish to.
The advantage of this will be huge as today if I want to change the decimal places for say Sales figures from 2 decimal places to no decimal places I have to go to all the measures individually and set them. Once you have the feature I described above it will be going to a place like Project Properties and changing in one place and it is done. I am sure this will be a great hit among the end customers and partners.