OUTPUTLEN can be used to setup the width of the column (if you don’t use automatic column width optimization). When automatically created, usually it have the value of the maximum field width, but when ...
... table field. But if you’ll have unstoppable need of filling it, then the behaviour of the column will be exactly the same like you would use DATATYPE field, means JUST, OUTPUTLEN, INTTYPE, INTLEN and DD_OUTLEN ...
DATATYPE field has small influence on the way the column is displayed. You can omit this field and then ALV grid will automatically fill this field and additionally JUST, OUTPUTLEN, INTTYPE, INTLEN and ...