I love when my clients post using Ariba Exchange --thanks, Sean.
While Sean and I had a call about this, I thought it would be good to let all know that Ariba is currently investigating this as a potential defect. If you are experiencing similar issues with approvals in mobile devices, I would encourage you to submit a service request via Ariba Connect. Once more details are available on the resolution path for this, I will be sure to post here.
Partner, Global Accounts