MB5B External API IN 2SL PUBLIC CLOUD

Hi Expert

We have a requirement to display the material stock based upon the date in 2SL Public Cloud, So we have used the one CDS ('I_MaterialStockTimeSeries'). which has a date parameter to display the value. It is working fine in custom CDS view ,but while expose that CDS into external API that is giving error due to parameter. when I removed the Parameter as follow the below screen-shot but I am not getting output based upon user input date. we are getting current date data only.

Thanks

Gourav bajaj