Comment 3 for bug 725921

Create two new products (both stockable):
P1: ENABLE ‘track manufacturing lots’ / ‘track incoming lots’ / ‘track outgoing lots’
P2: DISABLE ‘track manufacturing lots’ / ‘track incoming lots’ / ‘track outgoing lots’

Create incoming moves for both through ‘incoming shipments’ / source location ‘suppliers’ / destination location ‘stock’:
P1: qty 100 WITH new production lot 0000030
P2: qty 100 WITHOUT production lot

Real stock for both of them now 100 pce

Create new inventory ‘test prod.lot’ / save
Create two new entries:
P1: stock / qty 80 / WITH production lot 0000030
P2: stock / qty 80 / WITHOUT production lot

Confirm and validate inventory

Real stock now:
P1: 20 pce
P2: 80 pce

Entering qty in inventory line WITH production lot is handled as ‘stock lost’
Entering qty in inventory line WITHOUT production lot is handled as ‘counted qty’ (what you expect....)

Reproducible?