Share your thoughts on DirectQuery for Power BI datasets and Azure Analysis Services (preview)

This is a great feature, when using/testing it I run into the following problem though.

- I connect to an Azure Analysis Services tabular model

- Then I add a calculated column to a fact table using RELATED to add a value from a dimension table within the same model which has a one to many relationship with the fact table, no errors appear when doing this

- As soon as I try to use the calculated column (or something using it) in a visual this error appears:

- The strange thing is that this does work when doing the same thing but with a different dimension from the model (no error appears when using it)

What can cause this error? As far as I can tell I'm not doing something that isn't supported and as I'm referring to a table within the same model I don't see any issues (no limited relationship).

One thing that is different between the dimension for which this works and the one for which it doesn't: the key in the fact table which relates to the dimension which doesn't work has blank values as the dimension isn't applicable for all the rows. In this case I expect RELATED to return a blank value. Also I'm pretty sure this worked when I tested it earlier in the year.

Hopefully you can help me with this, thanks in advance!