How to Pass slash(/) in Odata service

Hi Everyone

i want to  pass data to GET_ENTITY set  method in odata service ,

but data contain the slash (/) EX: /ASU/CREATED_AT.

but service is giving error as Invalid URI segment ,

EX URL : /sap/opu/odata/Z/SALES_SRV_0/GetDDICElements('/ASU/CREATED_AT') .

than how to pass that data in url .

thanks

Regard

Harish