Nothing to configure: the behaviour applies to every transfer as soon as the
module is installed.

**Weighing a line**

#. Open the transfer (or the batch operator view) and type the real quantity,
   for example 0.87 instead of the demanded 1.
#. The move is marked as picked and, because 0.87 is below the demand, the
   demand becomes 0.87 too. The move stays *Ready*.
#. Neither the scheduler nor the validation of another transfer of the same
   product will change that quantity again.

**Notes**

* The demand is only ever lowered, never raised: above the demand the move is
  already fully reserved and nothing needs to be adjusted.
* A line left at zero keeps the standard behaviour, so the transfer still
  offers its usual backorder choice for what was not delivered.
* Chained moves (multi-step routes) are only frozen, their demand is left
  untouched so the next step of the route stays consistent.
* Lowering the demand is logged in the transfer chatter, and it is what the
  sale order uses to know how much is still to deliver while the transfer is
  not validated.