Reset delta function not available?

Hi.

I read an article (http://scn.sap.com/docs/DOC-26964) how to reset the delta management in a DSO. I like to use this feature to reset delta on request level between two BW systems which are connected by export datasource.

But I can only see the Where-Used-List dialog. Reset of delta for the target system is not possible.

Could somebody give me a hint why "reset delta management" is not available?

Thanks in advance,

Nils