Collections and Journal partitions

Hi,

I'm not sure if it was something I read, or was advised on a support call in the past, but is there some recommendation that collections should NOT be enabled on journal partitions?

I've had a skim through various documents I have, googled and searched through here, but not seeing anything that advises one way or the other so far.

Asking here just in case anyone knows off the top of their head, or maybe I've got my wires crossed, and theres no such recommendation!

Thanks.