Grouping in Reports - Single Category Header

[Seth_Kling]

I am missing something small, I can feel it .

I found this on the forum - and it got me to a 90% solution:
Single Category Headers in workflow

My Solution:

<<Start: ORDERBY(FILTER("Next Day Scheduled Trips", ([_ROWNUMBER] = MIN(SELECT(Next Day Scheduled Trips[_ROWNUMBER], ([_THISROW-1].[dvrcallsign] = [dvrcallsign]))))), [dvrcallsign])>>
    <<Start: FILTER("Next Day Scheduled Trips", ([_THISROW-1].[dvrcallsign] = [dvrcallsign]))>>
    <<if:[tripid]=INDEX(orderby(Next Day Scheduled Trips[TRIPID], [dvrcallsign]),1)>>
    <<[dvrcallsign]>>
    <<endif>>
    DATE: <<[DATE]>>
    TIME: <<[TIME]>>
    VEHICLE: <<[VEHICLE]>>
    DVRCALLSIGN: <<[DVRCALLSIGN]>>
    PUTIME: <<[PUTIME]>>
    DOTIME: <<[DOTIME]>>
    PUADDRESS: <<[PUADDRESS]>>
    DOADDRESS: <<[DOADDRESS]>>
     <<End>>
    <<END>>

The result:

What did I miss to make the ‘next’ driver have its own header?