Diagnosis
You are editing an input/output field for which the "scrollable"attribute is set, and want to change it into a box. The visible lengthof the screen element is less than the defined length.

System Response
You cannot scroll in a box text. The system therefore cannot convertthe output field into a box with variable text if the visible anddefined lengths differ.

Procedure
Before converting the field, remove the "scrollable" attribute. You cando this in the "attributes" screen or in the element list.