OAC 5 Essbase - Partial Data Load and the Clear Combination option in Data Load Rule

Summary

What is the syntax for defining a combination of members to implement a partial clear?

Content

When I'm defining a data load rule in OAC 5  - Essbase, I think I should be able to clear a specific combination of members using the "Clear Combination" option in a data load rule Property.   I'm working with a variation of the Sample.Basic outline and want to just clear "Sales" for "Apr" in the "Central" region. Will the following work (see screen shot)?  NOTE:  These are all level 0 members in my outline.  I assume I can't use UPPER members or member functions here.    It my case it seems to be clearing all of the data in my cube.  Documentation is