Operational tasks with the SDK

As I get more familiar with the SDK, I am trying to determine whether it's even possible to accomplish what I am trying to do - performing a cycle count, for example, from my own application and passing the counts back to SAP. I don't see anything in the web service side that will do this, and the only cycle count related methods I see in the DI API appear to be able to add items to be counted, but not actually perform the count. Before I spend much more time on it, am I trying to do something that just can't be done? Thanks in advance for any advice the community can provide.