IllegalStateException with Sirius >=6.3

[oconstant]

Creating a catalog in a modeling tool based on Sirius 6.3.3 or 6.4 fails as follows:
java.lang.IllegalStateException: Cannot modify resource set without a write transaction
at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.assertWriting(TransactionChangeRecorder.java:349)
at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.appendNotification(TransactionChangeRecorder.java:303)
at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.processResourceNotification(TransactionChangeRecorder.java:273)
at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.notifyChanged(TransactionChangeRecorder.java:239)
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:424)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.dispatchNotification(NotifyingListImpl.java:261)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:294)
at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:304)
at org.eclipse.emf.diffmerge.patterns.repositories.catalogs.PatternCatalogAccessor.createCatalogIn(PatternCatalogAccessor.java:88)

[barais]

Any news on the regression. It is not so easy to correct as we need to put some action within Emf Transactional Recording Command but it breaks the data flows?