Updates an existing purchase order's description, amount, currency, or items. When the total amount changes, item amounts are automatically recalculated based on their percentages.

Important Notes

• Purchase order must not be approved or completed
• User must have admin or owner role
• Item percentages must sum to 100% after update
• When amount_cents changes, all item amounts are recalculated
• Items can be created, updated, or deleted using nested attributes

Authorization

• User must be admin or owner of the company
• Purchase order cannot be approved or completed

Nested Item Updates

You can create, update, or delete items in the same request:

• Create: Include item without id field
• Update: Include item with existing id field
• Delete: Include item with id and _destroy: true