PowerPivot measures command - no really, don't modify it manually!
If you look in the metadata of a BIM file, or if you look at the .dax file generated by the DAX Editor, you will see the following perplexing comment:
---------------------------------------------------------- -- PowerPivot measures command (do not modify manually) -- ----------------------------------------------------------This is actually a meaningful comment. Despite having PowerPivot in the name, it is used in the tabular designer in Visual Studio as well. This header is used to tell the measure grid where the measures are in the model. Read more...