I want to use the mssql-xa datasource and encountered the following problem when JBoss wants
to commit the transaction.

org.jboss.tm.JBossRollbackException: Unable to commit,tx=TransactionImpl:XidImpl
[FormatId=257, GlobalId=xxxx//21, BranchQual=] status=STATUS_NO_TRANSACTION; - nested throwable: (org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl [FormatId=257, GlobalId=xxxx//21, BranchQual=] status=STATUS_NO_TRANSACTION)

What is going wrong? I use the normal access to the datasource via jndi in nested session beans that have "Required" transaction attribute for all methods.

Environment
JBoss3.2.2RC4
Windows XP
MS SQL Server 2000 SP3a
MS JDBC Driver SP1
datasource configuration as provided in jboss release

Any help greatly appreciated,
Vincenz