Hi,

Odoo's allowance of purchase order (PO) cancellation after goods receipt can cause inventory valuation discrepancies because it doesn't automatically reverse the inventory and accounting entries created upon receipt. This obscures the audit trail and creates inconsistencies. While Odoo might allow this for flexibility or user error correction, it's generally not best practice.

To address this, restrict user permissions to prevent PO cancellation after receipt, implement a proper return process using Odoo's return functionality, use quality alerts and inspections to catch errors before receiving goods, and review accounting settings to ensure correct journal entries. If needed, consider custom development for more granular control over the PO cancellation process.

Hope it helps