Diagnosis
You are editing a text field or an input/output field.
If you are editing a field text, the text is blank and no icon has beenspecified.
If you are editing an input/output field, the template is blank and noicon has been specified.

System Response
The system interprets this as a blank screen element which it cannotaccept.

Procedure
If you are editing a field text, at least specify a text or define anicon.
If you are editing an input/output field, at least specify a template,define a length (in order to create a template of this length) ordefine an icon by setting the checkbox "With icon".