arcgis 10.0 - How to solve "Cannot create topology" in ArcCatalog?

I have a FileGeodatabase in ArcGIS 10.0 with a feature dataset and five feature classes (3 polygon shapes, 1 line shape, 1 point shape).

I'm trying to create a topology to verify some vectors. Rightclicking Feature Dataset > New... > Topology.

I'm getting the following error message in ArcCatalog:

ArcCatalog cannot create topology. The selected feature dataset does not contain any feature classes which can participate in a topology.

Browsing the internet for the error message, I found this tech article by ESRI. It tells the following:

There are several reasons for a feature class to be excluded from participating in a topology:

• The feature class already participates in a topology or geometric network.


• The feature class is an annotation or dimension feature class.



• The feature class is registered as versioned.

I'm not quite sure what that means. There is no other topology or geometric network as far as I can see. What is an annotation or dimension feature class? The classes are all X;Y-coordinates only (2D). What is a versioned or registerd feature class?

I've tried checking all classes properties for something that sounds like that.

This answer to a similar question suggests to unregister the feature classes. But how?

Answer

It's one of these minor bugs in ArcGIS.

Refreshing the database view solved that issue: Right-click Feature Dataset > Refresh. A hidden existing topology was not displayed.