Attribute Rule

[MarlaJohnson]

I set up attribute rules in ArcGIS pro and now the data will not open in ArcMap. Has anyone experience this issue?

[JoeBorgione]

That is expected behavior.

Introduction to attribute rules—ArcGIS Pro | Documentation 

Adding attribute rules to a dataset impacts backward compatibility:

• Once attribute rules are added to a dataset, it is incompatible with ArcMap or ArcGIS Pro 2.0 and earlier. See Client and geodatabase compatibility for more information on functionality available when using mixed client and geodatabase releases.