Use the column checkboxes to build your query. Header columns sets/unsets all columns
SELECT MANDT, TABNR, TABSEQNR, SALESORG, DCHANNEL, DIVISION, AMOUNT, UNIT_AMT, PRICE_UNIT_AMT, UOM_AMT, VALID_FROM_AMT, VALID_TO_AMT, CALC_TYP_AMT, DISCOUNT, UNIT_DCT, PRICE_UNIT_DCT, UOM_DCT, VALID_FROM_DCT, VALID_TO_DCT, CALC_TYP_DCT FROM HRT7900