Battle of Kuban and Battle of Moscow purchase error

[AusMedic]

So with the current Steam sale, I tried to purchase the above and it tells me that I have to purchase Battle of Stalingrad to play these. I already have BOS but must have purchased this from the store, rather from Steam. Is this going to be an issue?  

[-DED-Rapidus]

@AusMedic, you need to link accounts before buying, please contact technical support https://il2sturmovik.com/support/