Sale Order Lock and Modification Control in Odoo#
Once a sale order is confirmed and production or picking has begun, unauthorized modifications can cause inventory errors, billing discrepancies, and customer disputes. Odoo's lock feature prevents accidental changes while providing a controlled process for legitimate amendments.
Enabling Order Lock#
Sales → Configuration → Settings → Lock Confirmed Sales:
- When enabled: confirmed sale orders are locked - no direct editing allowed
- Status shows: "Locked" after confirmation
Locked orders can only be modified via an unlock action.
Unlocking for Amendments#
Sales → [Locked Sale Order] → Unlock:
- Available only to users with the correct permission (Sales Manager or Admin)
- Order returns to editable state
After making the amendment:
Sales → [Sale Order] → Lock again to prevent further changes.
What Can't Be Changed After Confirmation#
Even with unlock:
- Quantities on lines already fully delivered cannot be reduced
- Lines already invoiced cannot be removed without credit notes
- These constraints protect financial integrity
Controlled Amendment Process#
For formal amendment requests:
- Customer requests change (e.g., add 10 more units)
- Sales rep creates a Sale Order Amendment note in the chatter
- Manager approves (via activity or manual confirmation)
- Manager unlocks → rep makes the change → re-locks
- Updated order confirmation sent to customer
The chatter shows full history: original quantities, who changed what, and when.
Handling Price Changes After Order#
If pricing changes after confirmation (e.g., price increase takes effect):
- The confirmed order retains the confirmed price (no automatic price update)
- If the customer agreed to the new price: unlock → update → re-confirm → re-send order
The price at the time of order confirmation is binding - this protects both parties.
Delivery and Invoice Synchronization#
When a sale order is modified:
- Additional units added: new picking lines created for the incremental quantity
- Lines removed: if picking not started, pick line is removed; if started, create a return
- Price changed: only affects future invoices; already-issued invoices are unchanged
Odoo prevents modifications that would create accounting inconsistencies automatically.