KB11455: Metrics with two facts and two functions cannot be saved as a Base Formula in MicroStrategy Developer 10.x

SYMPTOM:
Users find that metrics with two facts and two functions cannot be saved as a Base Formula in Strategy Developer 10.x
To reproduce this issue, perform the following steps using the Strategy Tutorial project:

• Create a new metric by opening the Metric Editor.
• Drag the Revenue and Profit facts into the metric definition, as seen below:
  

When saving this metric, notice that the option of saving it as a Base Formula is not present. As illustrated below, it can only be saved as a metric:

 
CAUSE:
This is a known limitation with Strategy Developer and it is working as designed. What the end user is trying to do is create a Formula out of other formula objects.
 
ACTION:
To save the metric created above as a Base Formula, perform the following:

1. Open the Metric Editor and drag the first fact into the metric definition.
2. Save the metric as a Base Formula.
3. Edit the Base Formula and drag the second fact into the definition.
4. Now, when saving this definition, it will be saved as a Base Formula.

Another solution can also be to:

1. Open the Metric Editor and drag the first fact into the metric definition.
   
2. Click on Formula
3. Drag the second fact into the definition pane
4. Now, when saving this definition, it will be saved as a Base Formula.