# Product Module¶

The Product module defines the following models: Category of Unit of Measure, Unit of Measure, Product Template, Product and Product Category.

## Category of Unit of Measure¶

A Category of Unit of Measure is simply defined by a name.

## Unit of Measure¶

A Unit of Measure is defined by:

- Name.
- Symbol.
- UOM category.
- Rate and a Factor (the later is the inverse of the former).
- Rounding Precision and Display Digits, used to round and display quantities expressed in the given UOM.
- Active, allow to disable a UOM.

## Product category¶

The Product Category Model is just composed of a name. Product Categories are organised in a tree structure.

## Product Template and Product¶

The product concept in Tryton is composed of two models: Product Template and Product.

The Product Template model contains the following fields:

- Name.
- Type, whose value can be
*Goods*,*Assets*,*Service*. - Category.
- List Price, the default sale price expressed in the List Price UOM. product.
- List Price UOM.
- Cost Price, the cost for one unit of this product expressed in the Cost Price UOM.
- Cost Price UOM.
- Cost Price Method, which can be
*Fixed*or*Average*. Defines how the cost price should be updated.*Fixed*means that the cost price stay unchanged.*Average*means that the cost price is the average cost of all the items that are in stock. It’s default value can be defined on product configuration. - Default UOM. The default UOM for this product. Used for example to express stock levels.
- Active, allow to disable a product.

The Product model extend the Product Template with two fields: Code and Description. If a sequence is set on product configuration the code will be readonly and will be filled in using the sequence. It’s also possible to define a list of identifiers on product. An identifier is composed by a type and a code. The following types are available:

- International Article Number (EAN)
- International Standard Audiovisual Number (ISAN)
- International Standard Book Number (ISBN)
- International Standard Identifier for Libraries (ISIL)
- International Securities Identification Number (ISIN)
- International Standard Music Number (ISMN)

## Configuration¶

The product module uses the section product to retrieve some parameters:

- price_decimal: defines the number of decimal digits with which the unit prices are stored. The default value is 4.
- uom_conversion_decimal: defines the number of decimal digits with which the conversion rates and factors of UoM are stored. The default value is 12.

Warning

They can not be lowered once a database is created.