OCA / purchase-workflow / 1215

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[ADD] purchase_order_variant_mgmt (#288)

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Handle easily multiple variants on Purchase Orders
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This module allows to add/modify all the variants of a product in a direct
screen without the need of handling them one by one.

Configuration
=============

* Configure your user to have any permission from "Purchases" group.
* Create a product with 2 attributes and several values.

Usage
=====

* Go to Purchases > Purchase > Requests for Quotation
* Create a new quotation or edit an existing one.
* Press "Add variants" button located in the upper right corner of the
  "Order Lines" tab.
* A new screen will appear allowing you to select the products that have
  variants.
* Once you select the product, a 2D matrix will appear with the first
  attribute values as columns and the second one as rows.
* If there are already order lines for the product variants, the current
  quantity will be pre-filled in the matrix.
* Change the quantities for the variant you want and click on "Transfer to
  order"
* Order lines for the variants will be created/removed to comply with the
  input you have done.

As extra feature for saving steps, there's also a button on each existing line
that corresponds to a variant that opens the dialog directly with the product
selected.

Known issues / Roadmap
======================

* The inline button for modifying quantities for an existing line won't
  work correctly until these 2 PRs are merged in Odoo:

  * https://github.com/odoo/odoo/pull/13558
  * https://github.com/odoo/odoo/pull/13635

  The problems are already fixed in OCB.

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