Results not as expected on O-Data Service

When we are trying running a Query on browser

“https://sapes1.sapdevcenter.com/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection? $filter=Region eq '03'”  it does NOT fetch results as expected. ?

The returned data from the query returns Region which is not equal to 3 which means the filter is not working.

Please advice ,

Thanks in advance