First In, First Out (FIFO)

FIFO means using the oldest eligible units or cost layers first. In ERP, distinguish physical removal order from inventory costing: selecting the oldest stock and assigning its cost are related concepts but different settings.

Odoo provides FIFO costing and a separate FIFO removal strategy. Costing affects stock valuation, while removal rules select stock for picking; configuring one does not automatically establish the other.