The SubmitButton item style is used to submit the OAF Page. The destination attribute of the submitButton is always ignored and in place of it the destination of the form is used as destination by Oracle Apps Framework.
It also has the fire action property that you can use to handle the validations for the values being submitted with the form.
Corresponding web bean: OASubmitButtonBean
Import Path: import oracle.apps.fnd.framework.webui.beans.form.OASubmitButtonBean;