Is that EventDisp entry all 1 line? If so, that's your problem...you have line breaks in there...
This:
0xfff0001e P "CreateEventWithVariables({C CURRENT_MODEL},{H 0xfff0001f},\SetEventVariable(GetEventVariableList(),{H 0x12b4c},\Append({S \"Testing DAT\"},GetEventVariable({U 2}))))"
Needs to be this:
0xfff0001e P "CreateEventWithVariables({C CURRENT_MODEL},{H 0xfff0001f}, \
SetEventVariable(GetEventVariableList(),{H 0x12b4c}, \
Append({S \"Testing DAT\"},GetEventVariable({U 2}))))"
Or this:
0xfff0001e P "CreateEventWithVariables({C CURRENT_MODEL},{H 0xfff0001f},SetEventVariable(GetEventVariableList(),{H 0x12b4c},Append({S \"Testing DAT\"},GetEventVariable({U 2}))))"
Be sure to press the Update Event Configuration button on the VNM after making that change.
Cheers
Jay