Hi!
Thank you for your question. Its not that big of a deal that you bookkeep revenue from both goods and services on the same account, but I'ts better to separate so that you can see in your result report how much revenue you have on each thing to better keep track.
The best thing would be if you can get it separated in the Zettle settings, which you usually can if you talk to them and you do the right settings. Then you wouldn't have to edit every journal entry when you sell both. Either you edit the journal entry or you make a new manual verification/entry were you put the amount in debet on 3041 and kredit on 3051 to move the correct amount.
Have a nice day!
Josefine