No of fields in table t157b changes when we execute

Hi all,

when we see table T157D through se11 it is showing 3 fields MANDT, BWART, GRUND in fields tab but when we execute it, it is showing 4 fields MANDT, BWART, GRUND, GRTXT from where this 4th field is coming. I have write a small program to check the no of fields in table T157D BY using SELECT * FROM T157D into IT_T157D here it showing 3 fields MANDT BWART GRUND in internal table. but if we see this same table in se16 or se16n it is showing 4 fields.

Can anybody please say me why it is happening so

Thanks in Advance