Did you ACTIVATE master data of the info-object ?. With DTP (unlike direct scheduling) there is this additional step that you may be likely to overlook. Without activation of master data, you wont see any data in the target cube even after DTP.. I don't recall chicken or egg first but you can check this quickly.
Secondly also check if you activated the request in your DSO. Without activation, you cannot "view" data in the target infocube
Thanks
BS