[galaxy-dev] Creating new dataset collections in a workflow

Hey, So, I've been working on a tool which will product a new dataset collection as output. I was following some of the instructions from https://bitbucket.org/galaxy/galaxy-central/pull-requests/582/allow-tools-to.... I managed to get the tool itself working, but when I go to use it in a workflow I'm getting errors. Mainly: History does not include a dataset collection of the correct type or containing the correct types of datasets I'm wondering if there's something I'm doing wrong, or if tools which product dataset collections are not supported within workflows? I'm working with the second case in that merge requests, using an input list as the structure for my output list. Thanks, Aaron