Product create API - Validation message is not display for 'apply_on_rategroups' parameter

Steps :

Check in Admin side
1. Go to Services > Products > Product create API
2. Enter valid input for all parameters and enter unavailable rategroup id in
'apply_on_rategroups' parameter and run the api
3. Check creation_date and last_modified_date time in Response and match with GUI

Expected result : For 'apply_on_rategroups' parameter validation message should be display for Unavailable rategroup and record Not to be created.

Actual result : Here in this case validation message is not display for Unavailable Rategroupid and api run successfully and record also created