Hi,
As for now you have 3 options in Item List: add rows, update rows, and replace rows. But there is no option to delete row. It would be really handy especially if there are some flaws in process and some rows on item list that shouldn't be there. Now if you want to delete them by action you have to use Replace Values option with SQL Query that returns only rows, that you want to leave in the form, so other rows are going to be deleted. The problem is that every row is deleted and than rows from SQL Query are added so every row have new DET_ID.
It would be nice, to have option to delete only rows that we want, and other rows will have there old DET_ID.