[tony_sologubov]

Thanks for explanation @xgarb. I am still unsure about your business logic though, so I need to dig into your requirements a little further.

Why does your client even need SKU generated for a set of options? Probably they want to use them after an order is already placed (e.g. for getting items from warehouse). In this case, it will be easier for you to hide default SKU field for a product and then add a completely new field that will be saved during adding product to a cart and then displayed on the order page.

So, could you please let me know why your client needs SKU generated for a set of options?

Tony