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Product quantity can be bound to different policies. The policy defines how the module behaves and how it manipulates the quantity of the product.

When a user enters the quantity, the ordered quantity can specify a number of items (pieces, packs, etc.) in a shopping cart. When the user presses the "Add to Cart" button, the module adds a row to the order. When the user adds more items of the same product, the module combines all specified quantities in the same row. It is a regular PrestaShop behavior.

The ordered quantity can specify a number of whole units (but not items), for example, meters. When the user enters the quantity of 45 meters for the rope, the shopping card will contain one product (rope) with the specified length of 45 meters and not 45 items of the rope as it would happen in the standard PrestaShop installation. While using whole units, every time when the user presses the "Add to Cart" button, the module adds new row with the specified quantity to the shopping cart. Note: you can override this behavior by choosing aggregate quantities option in "quantity mode".

The quantity can also specify the fractional units (quantity in decimal values), like kilogram or meter. This is the mandatory behavior for the grocery or fabrics shops. While using fractional units, every time when the user presses the "Add to Cart" button, the module adds new row with the specified quantity to the shopping cart. Note: you can override this behavior by choosing aggregate quantities option in "quantity mode".

The display mode used in the current example:
- reversed price display (display unit price as price)
- display base unit price for all combinations
- hide extra details for unit price in orders and invoices

The display mode defines how the module presents the product price.

In normal mode, the module displays the product price as defined by the theme. Usually the theme emphasizes the product price to attract user attention.

In the reversed price display mode the unit price is used as the main displayed price on the product page and replaces the regular price on the home page and in the categories or cross selling products pages. If you sell an expensive product, you can specify the small units with the low price and make you product looks more attractive for the user.
Note: you need to specify a unit price text for the reversed price display mode.

The display retail price as unit price mode instructs the module to display a retail price in the position of the unit price. This mode is useful when the product has combinations and the combination prices are differ from the base price.

The display base unit price for all combinations mode instructs the module to display the unit price calculated for the default attribute for all combination. This mode is useful when the product has combinations with different prices and you would like to display additional price information that does not depend on the combination price.

The display legacy product price mode instructs the module to display a legacy product price instead of a dynamically calculated product price.

The display unit price in orders and invoices mode instructs the module, for products with unit price greater than zero, to display a unit price as an extra detail in orders and invoices.

The display number of items instead of quantity mode instructs the module to display a number of ordered items instead of a dynamically calculated product quantity. This mode is useful when the product uses the multidimensional features and the total calculated quantity depends on the number of items and the quantity or size of each item.

In order to provide more information to the user the module displays different texts and additional details about the quantity, product price, unit and total price in orders and invoices. Sometimes it desired not to show this information. You can fine-tune the display of these details by selecting to hide extra details for unit price, quantity and total price in orders and invoices.

PrestaShop Product Properties Extension module allows you easily create sophisticated shop with features that are not available in the standard PrestaShop installation. It is not just simply one more PrestaShop module. It is an integrated PrestaShop solution.

The Product Properties Extension is a mandatory engine and required for all PS&More solutions to work. Other PS&More modules are plugins that extend the Product Properties Extension functionality and add more features. You need the plugins only if you need these additional features.

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