IRU has some function related to the parameter sku.
If I understand the function of the parameter sku is to add a number or value that identifies a particular product.
I have doubts in this regard are as follows:
What could be the main format of the sku?
The parameter or value added could Sku automatically once you have created the first product?
I believe it is at your discretion.
SKU - Stock Keeping Unit, http://en.wikipedia.org/wiki/Stock-keeping_unit.
Only virtuemart_product_id is automatically generated.
Thanks for the information AmStaF, now if I have been more clear everything related to sku.
The other one is the parameter of Vituermart SKU is automatically or must be added manually.