If it Is via Sat BOX with a Sat SIgnal, Switch your Channel to a Sat Channel and then you can record the IPTV Channel..
Do not switch to IPTV while it is recording.
or, as above, Get a Multi Line.
If not a Sat BOX or Signal, get a Multi Account...
Or better still, get a Provider that offer 5/7 days catch up and get extreme Editor Installed to get this on your Enigma2 box.
If not an Enigma2 Box, get a Provider offering 5/7 Days Catch-Up and no need to Record..
So many different ways and reasons here and you have given us very little details to what you have as a Set-Up