I suppose "details" is in the GUI? No idea.
A virtual transaction is a transaction that does not exist in the blockchain. For example, when the market matches a BID with an ASK, the resulting transfer of assets between the trading parties is put into the database as a virtual transaction. (Because the market operates in a completely deterministic way, every client will handle this BID/ASK match in the same way and create the same virtual transaction for this. Putting this into the actual blockchain would be redundant and only lead to bloat.)