Hello everyone,
During creation of Aggregate Measure, I sometimes refer to the standard Aggregate Measure in F&O. I often notice in their Aggregate Dimensions there is a KEY_ field created on them. How and when actually this field created ?
It's like when I created Aggregate Dimension, in one of the Attributes, that particular fields property I have specified the "Usage" as Key.

And in the Aggregate Measurement, in my MeasureGroup which is the FactTable, during setting Dimensions node, I'm using that "Key" field as the linkage.
but after Build and Synchronize, there is no Key field created inside my AggregateDimension.
Anyone can advice me on this ?