Define Top Link for Wall, Column or Zone

Or use the built-in Inverted elements criteria set from Edit > Find & Select to find and select any inverted walls, columns and/or zones.
Note: Use the Check for Inverted Elements command to find and list any inverted elements in your project. This command is not available by default in the ARCHICAD Work Environment. To use this command, customize your Work Environment menus to include it.
To set the highlight color of inverted elements, use the control at Options > Work Environment > On-Screen Options:
Use uniform color to highlight inverted elements: Check this box to display inverted construction elements (those whose top elevation falls below their bottom elevation, as a result of changing story levels affecting top linked elements) using a single color. To choose a color, double-click the color field.