transaction attributes for stateful session beans

[sid nagol]

hi
is the following statement true? i read it somewhere, and does not seem toberigt so, i am just trying to clarfy?
stateful session beans with CMT,which are trying to implemet sesion synchronization can have only following transaction attributes
required, requiresNew, mandatory.
the explanation given was stating its due to the reason that the transactional context is required to call thse methods.

but is it possible that some business methods can be in unsupported transactional context and rest in one of the other three??

i really appreciate ur time
thanks

[Praveen Kumar Mathaley]

if the business method has no transaction context then simply the sessionsynchronization interface methods are not called...
so,for the interface methods to be invoked, the business methods should have transaction...