RWA
Gets attributes from an attribute table. You cannot write back changes to the values of intrinsic attributes but you can write back changes to other attributes.
Note: ROA is the non-writable version of RWA. To disable write back in
                              			 a cell values formula, change RWA to ROA or clear the 
                              			  option in the 
                              			 Edit OLAP Formula dialog. 
                              			 
                              
 
                           		       See ROA.
Syntax
                           =RWA( "database alias", "cube", "hierarchy name", "attribute
                              			 name", "element name") 
                           		       
Example
=RWA("Best Practices OLAP","Sales","[Product]","Att2_German","[Product].[All
		Tires].[Car Tires All Season]")