Hi, I observed a curious thing:
I exported all product variants to a csv file to update two numbers for the warehouse (length and width). I then imported that csv file, but not under "product variants" > "Import records", but under "products" > "import records".
The exported ID was " __export__.product_product_43772_0d0d8199". I used this to update the products variant by importing the new csv under Products > Import records.
But instead of updating, Odoo imported a completely new product with a completely new ID.
The curious thing was, that all of the product variants I tried to update had a new external ID afterwards. The before mentioned product has "__export__.product_product_43772_b62b7404" now. As you can see, only the random part after the last underscore has changed. Same thing with the other IDs.
Does anyone know why that is? I am quite new in the Odoo world, though...
PS: I finally got it and exported the external IDs again, imported the data under "Products Variants" > "Import records" and voila, it worked.