Connecting to a QVW that is being refreshed/reloaded on the QMC from NPrinting may cause metadata connection errors since the file is likely going to be locked by the reload/refresh process on the QMC. So no it is not advisable to perform a metadata reload in NPrinting to a QVW that is in the process of reloading/refreshing on the QMC.
To mitigate NP metadata connection issues to a QVW that is in the process of being reloaded on the QMC and to ensure you are retrieving the QVWs data updates, you may wish to:
1. Make a copy of the QVW that is reloaded every 30 minutes.
2. Use the copy of this QVW for NPrinting reporting purposes
3. Do a Binary Load to the Primary QVW for to the NPrinting reporting QVW for data purposes.
The QlikView Community has several examples as to how to perform a binary load if needed.