The prerequisite to DLFL an order is that the cost balance is zero.
This can be achieved either by not posting any activity to the
order, or by settling the cost. Settlement can only occur once the
order has been received into stock (DLV), so if there is a
problem TECO is used to override that prerequisite.
In short. TECO is not needed to DLFL an order. It is only needed if
you want the order to settle and eventually archive
because you do not have the status DLV (received into stock).
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