closing an open batch

Good day all,

I have a user group that should have rights to close an open batch, but cannot. They can take ownership of the batch, but the "close" button remains grayed out. I've wandered through Security and have found the Batch Details Windows tab, Batch Reports, and the Conts Batch Posting, but all of the security rights are lined up with those groups who can close someone else's batch.

What have I missed? 

Thanks for your help!