parking lights some work some dont

[vanstek]

An engine is used as lead unit in an emu, and the same engine flipped is the last unit. The engine lights for AI work correct with 3 white front lights and two red tail lights. The emu used as player train has correct dim or bright front and tail lights.
After use of binpatch 1.8 for reversed cab, the dim and bright lights work correctly.
However a programed parking light ( single white light ) for a player train with the light switch off works only in the lead unit or the reversed lead unit, not in the tail unit or the reversed tail unit.?
Is this a known MSTS bug that after the lead unit is seen with lights off, no further unit is checked for lights ? Or do I make a mistake in programming : Conditions ( Headlight ( 1 ) Control ( 2 ) Unit ( 3 ) ) or Conditions ( Headlight ( 1 ) Control ( 2 ) Unit ( 4 ) ) ???
Wim