Seam and Jbpm createSchema - transactions problem

[trouby]

Hey,

I have a simple Seam components that injects jbpmContext in with a very simple method that creates the JBPM schema,
Here's the code:

@In
private JbpmContext jbpmContext;

public void createSchema() {
jbpmContext.getJbpmConfiguration().createSchema();
}

When invokes, this code results the following error:

java.sql.SQLException: You cannot commit during a managed transaction!
        at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.jdbcCommit(BaseWrapperManagedConnection.java:581)
        at org.jboss.resource.adapter.jdbc.WrappedConnection.commit(WrappedConnection.java:482)
        at org.hibernate.tool.hbm2ddl.ManagedProviderConnectionHelper.prepare(ManagedProviderConnectionHelper.java:30)
        at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:180)
        at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:133)
        at org.jbpm.persistence.db.DbPersistenceServiceFactory.createSchema(DbPersistenceServiceFactory.java:108)
        at org.jbpm.JbpmConfiguration.createSchema(JbpmConfiguration.java:459)
        at org.jbpm.JbpmConfiguration.createSchema(JbpmConfiguration.java:451)
        at velo.ejb.impl.WorkflowBean.createJbpmSchema(WorkflowBean.java:55)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
        at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
        at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)

This is probably since JBPM commits the transaction when the method is invoked, I tried to annotate the method with:

@Transactional(TransactionPropagationType.SUPPORTS)

But it didn't do any change,

How can I make seam not to start/commit the transaction and leave the work for JBPM?

Thanks,

Asaf.