Technical Ducato ZF Transmission Warning. only when headlights turn on ?

[Whatho]

Advice please re; 2020 Ducato with 9 speed ZF @ 10,000 miles on the clock .. without Headlights Camper Van drives as normal.. we are driving then "Turn On Headlight" when in drive & dash warning statement shows up about Parking Lights then that warning goes out straight way.. However at same time the Grey Transmission warning light is now ON.. this transmission dashboard warning is the "Gear symbol with the Exclamation mark".. Ducato still drives without issue while this gear warning shows on the dash display stays ON .. Solution Turn Ignition OFF then back ON start engine running with the vehicle stationary & this the transmission warning symbol is gone .. Then select normal drive & Van Drives without issues through the journey ,, But when the Headlights get to turn ON the Transmission Warning symbol re- shows.on dash display & continue to show until next time the ign; off.
Any ideas to a cause ?
Van is booked into Fiat Professional but receptionists says its strange one ?

 

[Whatho]

Problem sorted .. i found the transmission warning light came on whenever the front Lights were turned on when Drive was selected .. Transmission fault caused by a front Bulb "running light/ parking light bulb" . changed bulb to a Bosch ECO W21/5w DO5021LF & problem is fixed .