Why Preserve IDs option doesn't work correctly for my VirtueMart migration?

Due to the peculiarities, VirtueMart version 2 doesn't support IDs that contain letters (only numbers). That is why, when you move your store from a shopping cart that uses letters in its IDs structure, 'Preserve ID' option won't work correctly. VirtueMart will automatically generate new IDs for your products, customers and orders.

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