... mode, you’ll not notice probably any change
When you’ll setup this incorrectly, you may have problems when you allow grid to be editable, for example:
When I’ve set the INTLEN to ‘2’ for column FLTIME, ...
... 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 ...