Problem with GET <table>

Dear Friends,

I have upload one program for customer ageing report.

In that there is statements like GET LFA1, GET BSIK etc.

when i save and check it throughs an error that "lfa1 is not defined for the current logical database'.

but these statements are present in some standard reports.

why am getting the error, if same exist in the other reports.

Please guide me to resol