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What options are they to achieve a unique identification number for each item sold in a commerce store.

I want to have a unique number for each item on each transaction, the number needs to be unique across all transactions.

even if I have 5 of the same line item in an order I should still get 5 unique numbers.

I have a unique id number per item per order but i don't know how to achieve a truly unique id. Would appreciate any guidance.

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There a two main options there:

  1. Order ID
  2. Line Item ID

The Order ID is unique across all orders.

The Line Item ID is per-line item on the order and is also unique across all orders. Each line item on an order has a unique Line Item ID.

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prepend your unique id with the order number. Since it's already unique within the order, and presuming an order number is unique, [order-number]-[unique-id] should return a truly unique value with the added benefit of being traceable since the order number would have a searchable or reference-able value.

EDIT:

Further research yielded the module Field default token 

This module enables to use tokens as field default values.

Using this you should be able to create the order-ID combination (or any other combination). To prevent user tinkering, I would also suggest Field Permissions:

The Field Permissions module allows site administrators to set field-level permissions 
to edit, view and create fields on any entity.
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  • Their is an option in store=>products sku that will provide you to add unique id for each product sold or listed
    – harsh_behl_0007
    Commented Aug 23, 2014 at 6:15
  • I believe op wants a unique number for each item on each transaction, not a unique item number as they indicate they already produce a unique id per transaction, but that number isn't necessarily unique across multiple transactions
    – Geoff
    Commented Aug 23, 2014 at 14:22
  • @Geoff Yes thats exactly it. I would like to have a unique number for each item on each transaction that's unique across all orders
    – Samp
    Commented Aug 23, 2014 at 15:14
  • see my edit....
    – Geoff
    Commented Aug 23, 2014 at 15:45
  • @Geoff ok so if i understand that correctly after adding a field to the line item and specify the correct token, each time an item is added to an order it should have a unique id.
    – Samp
    Commented Aug 23, 2014 at 16:57

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