Force server round trip

Hi All,

I have a requirement where I have two fields. One is drop-down and other is input field(mandatory field). Based on the dropdown value input field gets populated automatically. But error message still shown in the message bar since it is an mandatory field. User need to press enter to remove this error.

I am trying to use server round trip in p_method of input field using fp_server_name but the property server name is not set for input field. How can I remove this error message without pressing Enter and is there any other way how can I trigger server round trip.

Thanks

Lalit