Reg:Unable to claim a Task using BPM OData

Hi,

I am using BPM OData services to start,claim and complete a task .I am successfully able to start a process,Get data from a Task using OData services but not able to claim a Task.

I did try to test using Postman client but was getting 404 Error when I try to claim a task.

Can anyone help me in this context as it is very urgent for me.

Thanks,

NWUser