FEFO & protocol picking

Prefer the oldest suitable lot. Protocol pick sessions still exist but are not on the main menu.

Need reagent
    └── preferred lot available?
            ├── yes ──► confirm / scan ──► override barcode (if needed) ──► complete session
            └── no  ──► exception (stock / validation / lab)
                        └── fix: transfer / procure / validate ──► retry

FEFO at the bench

1. Prefer open suitable stock, then the oldest unopened lot (validation and storage OK).
2. Opening a newer lot while another open vial of the same reagent still exists → enter FEFO override justification on Open Item. The form also asks you to confirm storage, booking-in project, and attribution — those values seed the usage trail.
3. Use Inventory → In Stock or Search, sorted by expiry / received date, to pick the oldest lot before you open.

Reports → Inventory includes FEFO override exceptions (audit) for a PDF/XLSX of recorded overrides.

Protocol pick session

Not shown on the main menu. When enabled:

1. Open /stock/picking/ → New → protocol → open session.
2. Each line: preferred stock, storage, status.
3. Retrieve → scan/confirm → Complete session.
4. Override barcode only when the preferred lot cannot be used.
5. After work: Use Item / finish empties; return remaining to the correct storage.

Exceptions

No preferred stock → check availability, validation, expiry, and lab scope.

• Other lab → Inventory → Transfer Requests or switch lab. See Access & labs.
• None in any lab → Procurement tracker (Refresh low-stock / expired-stock rows).
• Pending validation → Not validated list, then Validate Item.