Testing entity set with multiple keys in browser URL

Hello,

I am testing a Gateway service entity set with multiple keys.I am not able to test it.where as for a single key.I am easily able to test it.

For a single key,I am able to test it with the following URL

/sap/opu/odata/sap/Z_BANK_SRV/BANKS('AU')

but for multiple keys,I try to use the following URL

/sap/opu/odata/sap/Z_BANK_SRV/BANKS('AU','0018143').It doesnot work.

can any one,please help me out.

regards

Kaushik