Netweaver Gateway URI or Odata URI Optional parameter (The request URI contains an invalid key predicate)

Hello,

I created a Entity type and contains parameters then i put one property type as optional and rest of the parameters type as key. So i have ran the Query/URI but i get the error like 'The request URI contains an invalid key predicate'.

Example:

Entity Type : Request

Properties : Name Type : Optional

Properties : Age    Type : is Key

Properties : Place  Type : is Key       

GET Call :

If i call the below URI i get the error mentioned in the above

URI-1: sap/opu/odata/sap/z_sample_test_srv/RequestSet(Name='abc',Age='25',Place='India')?$format=json    ->  Error

If i call the below URI i get respose as successful.

URI-2: sap/opu/odata/sap/z_sample_test_srv/RequestSet(Age='25',Place='India')?$format=json  ->Success

I was wondering if you could confirm which URI is correct ..?

If 1st URI is wrong what is the solution to use optional parameter in URI..?

Thanks,

Suresh