Products without variants have wrong SKU

Hello

We have noticed that when you import products from Shopify to Woo they have different type of SKU. Depending if Shopify product has variants or not, this is the difference:

1. Product has variants: SKU = product ID – number from url

2. Product no variants: SKU = SKU in Shopify

This is a huge problem for us as we have automated stock updating connected with Shopify by webhooks and all products without variants are not working now.

Can you tell us how we can update all products so Products without variants can have the same type of number = product ID / number from URL?

We simply cannot manually update 100s of products 🙁