Abstract: This invention relates to the necessary processes and application enhancements to provide customer extension functionality in terms of displaying additional configurable text fields in a web application. When a message (310), describing the additional text fields on header and/or item level by means of name-value pairs, is received, the additional text fields are mapped into the database (250) of the business application. To get displayed the additional fields are mapped from the database (250) into an instance of a container class in the model component. By passing the instance of the container class from the model component to the view component, an HTTP response is created using the information provided by the instance of the container class. An HTML Browser (200) receiving the HTTP response displays the additional fields.