Nothing Reported - Nominal Ledger (4000) General Sales when adding a “Convert to comment line”, this has only just arisen as the Sales Invoice is for other N/L sales codes.
If adding a comment line and the other lines are for different N/L codes an entry is created in General Sales for the comment line. I would expect a comment line not to create any kind of entry in the nominal ledger.
Perhaps have a look at these comment lines so no such entries are not created.