Ok looked at it - ran fine without a problem.
So, I am sorry to say that you will need to contact your systems support people.
I do not know your network setup, etc. but would concentrate
on the ISPF configuration file along with possibly the TCPIP setup for TN3270 at your target system/lpar etc..
Also - possibly could be a known bug with z/OS V7 and the
ISPF that comes with it? - IM still on z/OS 1.4 ISPF
Now, unless your not telling me something that you maybe doing differently I have assumed you are using a standard
3.4 Dataset list, Edit the PDS member, or are u using a
'custom' editor and/or editor macro.
If you are just using plain IBM supplied stuff, you will
need to get in touch with your systems people about this
Sorry, I really do not think I can be of anymore help or if I have been any help at all.
Gary
zSoftware