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When I try to snap a staircase to a landing that I created, a message states:
What does this mean?
In Chief Architect programs, only one stair section should be snapped to a given edge of a stair landing. This message will display when you attempt to connect more than a single stair section to a single edge of a stair landing.
This can be resolved by breaking the single landing edge into a two separate collinear segments.

edit button, then click once between the two stair sections to break the landing's edge into two separate segments.