pos/pos_pricelist

Dynamic Price for Odoo Point of Sale
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Motivation :
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Many issues report this feature. This why I took decision to start this module

Reported issues :

`odoo 8 POS price list discount has no effect. <https://github.com/odoo/odoo/issues/3579>`_

`ODOO POS Pricelist - Public Price & Discounted Price in Receipt. <https://github.com/odoo/odoo/issues/1758>`_

`V8.0 pos gives wrong price when using min qty in pos pricelist <https://github.com/odoo/odoo/issues/2297>`_

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Goal of the module :
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The goal of this module is to bring the pricelist computation engine to the POS.
This module loads all the necessary data into the POS in order to have a coherent behaviour (offline/online/backend).

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Implemented features : 
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1.  Attached pricelist on partner will take effect on the POS, which means that if we attach a pricelist to a partner.
The POS will recognize it and will compute the price according to the rule defined.

2. Fiscal Position of each partner will also be present so taxes will be correctly computed 
(conforming to the fiscal position).

- Implemented Rules are :

1. (-1) : Rule based on other pricelist
2. (-2) : Rule based on supplierinfo
3. (default) : Any price type which is set on the product form

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Missing features :
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- As you may know, product template is not fully implemented in the POS, so I decided to drop it from this module.