Your post has minimum info, to solve this more information is need. For example.
1. What type transactions are you using? (CMT or BMT)
2. What are the transaction attributes?
3. Datasources are they all XA? How many do you have?
Please put in more details so that the problem can be understood.
I use CMT, the transaction attributes are set to REQUIRED
I have two datasources and they are both XA.