Purchase Create Bill Button
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This module restores the Odoo 17 behavior on the Purchase Order form view:

* Adds "Create Bill" buttons in the header of the Purchase Order form view.
* Ensures the "Vendor Bills" smart button is visible even when there are no associated bills yet.

Features
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* Adds a primary "Create Bill" button (highlighted) when there are items ready to be billed.
* Adds a secondary "Create Bill" button when there are no items to bill yet (allowing manual billing).
* Shows the "Vendor Bills" smart button as soon as the purchase order is confirmed.

Usage
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Install the module. Navigate to Purchase -> Orders -> Purchase Orders. Confirmed purchase orders will now feature the "Create Bill" buttons, and the smart button for "Vendor Bills" will be visible.