Adding two Filter conditions in MDX WHERE statement

I wanted to add two conditions which contains different dimensionality in MDX WHERE statement. After trying several syntax I was able to find the way.

SELECT {[Measures].[Sales]} ON ROWS, {[Store—Store].[Store].ALLMEMBERS} ON ROWS

FROM [SalesCube] WHERE {[Customer].[All Customer].[CustomerName]} * {[Store—Region_Store].[All Store—Region_Store].[RegionName]}

If you entered the WHERE statement incorrectly, you will get an error message as

The function expects a tuple set expression for the 1 argument. A string or numeric expression was used.