This module allows to associate a sequence to the product reference.
The reference (default code) is unique (SQL constraint) and required.
Support Product with or without Variants.

• Auto Sequence or code for every product.
• Auto Sequence or for every product variants, like product20171130-001.
• Product code must be Unique.
• Define different product type, each product type use own rule of sequence.
• Quick access in sale , inventory, system menu.
• Multi language support.

Sample Rule:

D171100001 for Manufactured Products.
C171000001 for Components Products.
S171000001 for Sourced Products.
17-year, 10-month.

Sepcial for variants. add [-00?]

Installation:

Prior to installing this module, if you have any existing products you should ensure they already have a unique reference (or no reference) set.
Products with a default_code of '/' or empty will automatically be assigned a code of "!!DP!!" followed by the system id for that product.
Otherwise the setting of the unique constraint will fail and the module will fail to install.
Notice:
Odoo product variants is very special.
When u create a product(not product template) with attribute, It would delete the first product, which have no attribute. So it's very normal that the first product variants begin wit ???-002.
And we make a rule that the product variants can only create after you create normal product template.