PMS GTN 750 waypoint altitude constraints question

With the PMS GTN 750 addon, what is the minimum waypoint altitude constraint you can enter? In the real thing you can enter any altitude, however for some reason the PMS one is not allowing anything under 1000’ msl unless its a part of an approach.

If you are trying to program in a manual approach with altitude constraints, it removed this feature for anything under 1000’. Anyone else run into this before and know of a work around?

I tried to find more information about his in the docs but see no mention of this odd limitation.

You’d probably have to contact PMS directly to get info as to why their product can’t enter a constraint lower than 1000ft