Screen Control Based on Control Data 
If screen control is effected depending on control data, you can
Screen control can be effected
The ABAP Screen Painter enables you to maintain the value of Modification group 3 for the screen fields in question
In Modification group 3, you assign a value between
001 and 050 to each screen field. Use the same value for screen fields that are modified in the same way. In the case of an input/output field, the same value is used as for the pertinent key word and a long text that may have been displayed. If screen fields cannot be modified using table T588M, assign the value SPACE in Modification group 3.You then use table T588M to determine
If you require further information on screen control depending on control data, please refer to the IMG on Personnel Administration and read the documentation on the step Determine screen modification in the section entitled Set Up User Interfaces.