How to handle null values using input parameters in Hana calculation view?

Hello,

There is a table which has null values in a column.

I've created one calculation view, and I'm using input parameters.

It's not displaying data when I execute the Calculation view because of using input parameters, due to null values in the table.

Following is the Filter expression I've used in calculation view:

AND (IN("CUSTOMER_TYPE",'$$ip_customer_type$$') OR MATCH("CUSTOMER_TYPE",'*$$ip_customer_type$$*'))

AND (IN("REGION",'$$ip_region$$') OR MATCH("REGION",'*$$ip_region$$*'))

Region column is null in the table. If I remove the syntax related to region, it gives data.

Plz help me how to make expression for handling null values using input parameters.  Variables doesn't suits to my requirement and hence using input parameters.

Regards,

Antony Jerald.