how to create three columna names for a new dataset with iml

[Bal23]

create dida from data6[colname='difference'  COLNAME=
'lower'  COLNAME=
 'Upper'];


	append from data6; 
	close dida;

proc print data=dida; 
run;

I want to have three column names for this dataset, dida, but I only have the first column name right, other two keep as

COL2 COL3.

would anybody teach me how to fix it? Thanks.

[Rick_SAS · Accepted solution]

create dida from data6[colname={'difference' 'lower' 'Upper'}];