Oracle Apps Framework creates the messageRadioGroup item style as a combination of the radioGroup and inlineMessage controls. You can have many radio buttons in the messageRadioGroup but only one of the radio buttons can be selected at a time. This is used wherever you want user to select only one value from many choices available. Suppose in your OAF page you want the user to select a payment method out of the three available options namely Credit Card, Pay Pal or Cash on Delivery (COD), then either you can use messageChoice bean or you can use the messageRadioGroup to achieve the same.
Corresponding web bean: OAMessageRadioGroupBean
Import Path: import oracle.apps.fnd.framework.webui.beans.message.OAMessageRadioGroupBean;