DI Server - Delivery Cancel

Hi Friends,

I want to cancel a closed delivery. I am sending the following structure to cancel delivery:

Before that I am doing the followings.

Sales Order add -> A/R Reserve Invoice -> Delivery(open)->Delivery(closed)

Now, I am trying to cancel the delivery which is closed.

http://www.w3.org/2003/05/soap-envelope"> http://www.sap.com/SBO/DIS"> 88

I am Getting an error 'Invalid execute command'

Please help as I am middle of Development.

Thanks

Surojit