Diagnosis
There is not enough room in the line to insert the chosen ABAPDictionary field.

Procedure
If you are using a text field (key word) you can select a shorter oneand insert it into the screen. If you want to use an abbreviatedversion of the long key word, you can do this by entering anappropriate value from 1..4 in the 'Mod' column. Otherwise, you shouldplace the Dictionary field in an empty line and move it afterwards.