Hitting Enter key on an input field does not trigger PAI event

Hi Experts,

After we upgraded to Netweaver 7.4, hitting Enter key on an Input field(Ex. fields under 'Org.Data' tab in ME21N transaction ) does not trigger any kind of event / round trip when the Transaction is opened in the web gui(browser). The event is triggered in a non upgraded system which is on 7.3.

The event is triggered when the the Tcode is opened in the Normal GUI.

Any suggestions would be helpful.  

Thanks,

Ajith Cheruvally