Discogs products do not have predefined attributes to use as an SKU.
With this being the case, Selro provides the capability to map the Discogs field into the SKU.
When downloading the Discogs catalogue, the following fields can be used as a SKU within Selro:
Discogs Listing Id (Default field for SKU within Selro inventory)
Discogs Catalogue Number
Discogs Location field
You can specify these settings by going to the Discogs channel connection in your account (go to your username in the top right corner > connections) select Discogs and click 'Advance Settings' next to the download the catalogue section.