Bean managed vs Container-Managed transaction

[Sushil Sureka]

Hi, I was looking at the ejb specs and in section 11.3.1 it says that A Session Bean can be designed with bean-managed transaction demarcation or with container-man-aged transaction demarcation. (But it cannot be both at the same time.) An Entity Bean must always be designed with container-managed transaction demarcation.   I don't understand why is it not allowed for Entity beans to be able to use bean managed transaction demarcation thanks Sushil