Dear Hamid,
Thank you very much for your input ! Indeed, I need to export Product Variants, although I have no variants. Furthermore I exported product_id/id , counted_quantity and added a unique id per product line in the import file. (e.g. Inventory1, Inventory2, ...)
If I import for the first time, it worked ! If I adjust again the counted_quantity , and not change the ID's (Inventory1, Inventory2) , I get an error. If I replace the ID's with a new unique ID, the products are duplicated, and in the end, one product gets an amount equal to the previous quantity, increased with the newly updated quantity.
So, I am almost there... but not yet. Any suggestion ?
Your help is highly appreciated !
Dirk