Create a polyline with an associative hatch with one hatch colour.
Draw Order > Back (send hatch behind boundary).
Now in hatch Properties change the hatch colour.
Hatch is now redrawn in FRONT of boundary (BUG).
Draw Order > Back (send hatch behind boundary).
Now in hatch Properties change the hatch colour.
Hatch is now redrawn in FRONT of boundary (BUG).