How to set Check Boxes and Radio Buttons in batch input.

In the batch input a Check Box is set by putting a capital X in the field and the same applies to a Radio Button.

Example: Definition in the internal table BDCDATA. PROGRAM     SCREEN  SCRSTART     FNAM               FVAL
------------------------------------------------------------------------
SAPMM06E    0300    X            RM06E-SELKZ(01)    'X'
                                                     `--> upper case X