If you have spent several hours trying to attach PrestaShop combinations to your products then here is quick solution.
- If you import products, then product reference = reference #
- If you import combinations, then product reference = product reference
So be careful what you are choosing in the dropdown when matching your import data with the characteristic.
In addition to this, there was somekind of snag also about updating stock and prices of product with combinations. If I get stuck to that again then I will write it here.