You mean message at the bottom ? You can use on-message trigger at form level and write 'null' in the code of the trigger.
I don't get any alert when i use form's save after any modification. Are you calling any alert on commit trigger?
Edited by: yoonus on Oct 13, 2012 7:43 AM
Do you have something like below code any where in your code bock
In this case form's default message and your message are happening at the same time, So that could be the reason you get a pop up with 'no changes to save'. Normally no saves to change is a message at the bottom.