Filter Expression for Multiple Entries and Is Mandatory

Hello Folks,

I'm using the Input Parameters in HANA Studio. I want the Filter Expressions for Multiple Entries (Single value - Unchecked), Is Mandatory (Optional - unchecked). Four combinations - for Mandatory - Yes/No , Multiple Values - Yes/No. Appreciate if you provide the same.

For Optional I got the below expression:

if(isnull('$$IP_MATNR$$') or '$$IP_MATNR$$' = '', match("MATNR",'*'), "MATNR" = '$$IP_MATNR$$')

P.S. https://archive.sap.com/discussions/thread/3905752 - Not able to get the solution.

Thanks

HANA Developer