Hi Peter
Nothing wrong with the route, it's a software bug. Put it in as you have or put it in without the DCT's in there and it will work fine PROVIDING the "Additional Crossed FIR's" boxes are empty.
Trouble is if you pull it out of your saved briefings (Briefing Handbook) you'll find the DCT's are NOT there AND EGTT is showing in the FIR's box, that's when it fails.
I'm waiting to hear back from EAD and in any case will be seeing them on the 14th. I'll let you know when the fix is produced.
Mike