Some “advanced” formula properties (see this blog post for an example) that pull in AEC Data not available in the automatic properties have to reference one of the AEC modules, and need to include the first two version numbers for the current version of AutoCAD® Architecture or AutoCAD® MEP that is running. The version numbers can be obtained by running the AECVERSION command in a given version. For example, AecX.AecBaseApplication.8.1 is the Aec Base Application module for the 2019 version.
If you want a formula property to work across multiple versions, it has to know what version is running to be able to call the correct application version. For a small number of versions, that can be built into the formula property without too much difficulty or confusion (see previously linked example). But I recently had a reason to revisit a formula that retrieved the elevation of a ceiling object (based on the Wall elevation formula in the example blog post), and, over ten years…
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