It' seems you can use HEAD function for your dimension expression, e.g.

HEAD([AuditStatusD].[H1].[AuditStatus].Members)

This will show only the first member from all the statuses for the set.

Also, you can sort the members of AuditStatus dimension by AuditDate. To do this introduce to the AuditStatus level in the cube AuditDate property (just drag it to the level from the properties list in the Architect) and apply the sorting for this property as Descending. It will sort all the members of the dimension AuditStatus level by AuditDate in all the queries and will show you the last one for the HEAD function.