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The Add Rule to Topology tool fails and returns "ERROR 000840: The value is not a feature layer" when executed from a Python window and background processing is enabled.

Last Published: March 25, 2015 ArcGIS for Desktop
Bug ID Number BUG-000085909
SubmittedMarch 6, 2015
Last ModifiedMay 5, 2023
Applies toArcGIS for Desktop
Version found10.2.2
Operating SystemWindows OS
Operating System Version7
StatusWill Not Be Addressed

Additional Information

We apologize that we were unable to address this issue within the current product support cycle. If the issue continues to affect your work in a supported release, please contact Technical Support. Note that ArcGIS 10.8.2 is the current release of ArcGIS Desktop and will enter Mature Support in March 2024 ( There are no plans to release an ArcGIS Desktop 10.9, and we recommend that you migrate to ArcGIS Pro. See Migrate from ArcMap to ArcGIS Pro ( for more information.


1. Disable the background processing. 2. Run the tool in a standalone integrated development environment (IDE). 3. Add the rule to the topology dataset via the Catalog window.

Steps to Reproduce

Bug ID: BUG-000085909


  • ArcGIS for Desktop

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