Field help (DDM3NB) 

Grid containing the multi open-item document lines
The modification rules of the fields are the same as those in the tprevious table.
In this 'multi open-item' grid, it is possible to delete or add lines, provided the addition of the amounts of the open items is equal to the amount of the document line.
It is only possible to add or delete lines if the amount of the open items can be modified.