Why is hotlinked module showing in pink in plan?

[LeeJaeYoung]

A.

B. 

The A.pln file was imported by hotlink from the B.pln file.
However, it has turned pink and a dot is visible in the center.
I want to know what the problem is, how can I find out?
How can I find out the error?

[Barry Kelly]

Are the top/bottom wall heights in the module linked to a storey with an offset above or below that storey.

If so they may now be 'inverted' which is why they are pink.

Barry.