[MIG] sale_order_invoice_untaxed_amount: migrate to 18.0

sale_order_invoice_untaxed_amount/README.md

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+# sale_order_invoice_untaxed_amount
+
+Display the invoiced and uninvoiced untaxed total in the sale order.
+
+This module adds two stored computed fields on the sale order:
+
+- **Invoiced Untaxed Amount**: the sum of the untaxed amounts of all
+  non-cancelled invoices linked to the sale order.
+- **Uninvoiced Untaxed Amount**: the remaining untaxed amount still to be
+  invoiced (`amount_untaxed - invoiced_untaxed_amount`, never negative).
+
+Both fields are displayed:
+
+- In the **sale order form**, below the tax totals block.
+- In the **sale order list view**, as optional columns (hidden by default)
+  with column totals.
+
+## Installation
+
+Use Odoo normal module installation procedure to install
+`sale_order_invoice_untaxed_amount`.
+
+## Configuration
+
+This module does not require any configuration.
+
+## Usage
+
+1. Open or create a sale order.
+2. Confirm the order and create one or more invoices from it.
+3. The **Invoiced Untaxed Amount** and **Uninvoiced Untaxed Amount** are
+   displayed below the totals block of the sale order form.
+4. In the sale orders list view, enable the optional columns **Invoiced
+   Untaxed Amount** and **Uninvoiced Untaxed Amount** to compare invoiced and
+   remaining untaxed amounts across orders.
+
+The amounts are recomputed automatically whenever the order state, its
+invoices, or the invoices state change.
+
+## Known issues / Roadmap
+
+None yet.
+
+## Bug Tracker
+
+Bugs are tracked on [our issues website](https://github.com/elabore-coop/sale-tools/issues).
+In case of trouble, please check there if your issue has already been
+reported. If you spotted it first, help us smashing it by providing a
+detailed and welcomed feedback.
+
+## Credits
+
+### Contributors
+
+- Stéphan Sainléger
+
+### Funders
+
+The development of this module has been financially supported by:
+
+- Elabore (https://elabore.coop)
+
+### Maintainer
+
+This module is maintained by Elabore.