A purchase policy only works if Odoo blocks confirmation when approval is missing.
- Agree bands with finance (e.g. under 1,000 auto; mid-range manager; high CFO).
- Map bands to Approvals steps or purchase double-validation settings.
- Separate product categories that need technical sign-off (IT, CAPEX) from consumables.
- Train buyers: draft → submit → wait; confirming without approval should be impossible.
- Audit monthly: purchases confirmed near thresholds often signal gaming.
DigitsCode often combines purchase restricted access, analytic distribution, and bill approvals. See Inventory & Accounting capability articles on /kb.