Incorrect response code after XA recovery

Hi,

I would like to consult with you a problematic response put by PostgreSQL after transaction recovery run by Narayana
(JBossTS).

I work on tests for Narayana and I hit a issue with PostgreSQL. The db returns incorrect code XAException.XA_HEURHAZ
whenthe TM does recovery after crash of the jboss eap app server. 
The exception is following:
Caused by: org.postgresql.util.PSQLException: ERROR: prepared transaction with identifier
"131072_AAAAAAAAAAAAAP//fwAAAd7TXOBR8jj5AAAAKDE=_AAAAAAAAAAAAAP//fwAAAd7TXOBR8jj5AAAALQAAAAAAAAAA"does not exist 

It's run on PostgreSQL 9.2 but the older versions seem to be affected as well.

The problem occurs when TM runs on JTS transactions.

The idea of the test:
The test enlists two resources to a transaction. There is called prepare on resource of PostgreSQL. The app server
crashesbefore prepare is called on second transaction participant. After restart of the app server TM tries to recover
thetransaction. As the fail occurs during prepare phase rollback is expected. 

The OTS specification requires both bottom up and top down recovery to be triggered by the recovering resource. This
causesthat two rollback calls are done against the DB. DB receives rollback call and does the rollback. Then for the
secondtime it returns the exceptional code. As the DB already rollbacked the transaction and forgot about it the DB
returnserror that no such transaction exists. But this seems to be against OTS specification. 
There are some more details in the following bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=988724

Do you have some experience with such behaviour? Can I suppose this being problem of PostgreSQL? Or is there already
somebug for this issue in Postgres bugtracking system? 

Thank you
Ondra