problem in consuming odata in sapui5 application

Hi all,

   I am trying to develop an sapui5 application consuming odata. I am using sap netweaver gateway demo system. I am getting the salesorder collection from the following url

https://sapes1.sapdevcenter.com/sap/opu/odata/sap/ZCD204_EPM_DEMO_SRV/SalesOrders

Now in my app, in order to display a particular salesorder, i am using the filter query.

There is a salesorderid '0500000000'

So  i used the query

https://sapes1.sapdevcenter.com/sap/opu/odata/sap/ZCD204_EPM_DEMO_SRV/SalesOrders?$filter=SalesOrderID%20eq%20'050000000…

But it again fetches the whole list of sales order ids.

I am failing to understand why the filter option is not working.

Kindly help me.

thanks and regards,

krishna.