A320 FMS altitude constraint in white
Question for those in the know. What does a white altitude constraint mean in the MCDU? I entered an altitude and upon inserting it, it was green, with a purple asterisk. So far so good. When I changed the altitude to a higher one, the asterisk remained purple, but the altitude was white. We also go the -TOO STEEP PATH- right below the line with the constraints.
Couldn't find it anywhere. Does anyone have an answer with a reference? Thanks