ActiveMQ out-of-order redelivery - resource adapter

Dear List!

We experienced the following problem using JBoss 7 and ActiveMQ-RAR:

In case a message cannot be processed by an MDB then out-of-order delivery
might happen.
We are using message grouping, still the order of the messages changes.

Does anybody has experience on enforcing strict message ordering with
ActiveMQ and JBoss 7?

Cheers,

Tamas