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BMC Remedy AR System Message Number
ARERR 8859 Invalid operation on overlay or overlaid object.
Details

You tried to perform an operation that is not permitted on an overlay or overlaid object.

In Best Practice Customization mode, AR System restricts the operations that can be performed on objects to ensure that you perform only changes that will be preserved during application upgrades.

To perform the operation on an AR System origin object, switch to Base Development mode.

Base Development mode gives you unrestricted access to create, modify, and delete AR System origin objects, such as out-of-the-box application objects, but your changes might not survive upgrades.