Hi Sarat,
does it work for you with Ekansh´s hint?
As an addition: Filtering for several values separated by 'or' works as well if you implemented the Query operation with your own code, without mapping a function module. The method ...GET_ENTITYSET() will have the parameter it_filter_select_options, this is the nested range table with one line for each filter conditions that you entered in the request URI.
The GET_ENTITYSET() method generated by the framework when you map a function module gives you a good hint how to "unpack" the range table and iterate through the lines, you can do it the same way in your own code.
Best Regards,
Ringo