How to debug oracle.jbo.InvalidOperException: JBO-26036: Recursive substituion for <VO>

Hello team,

I'm trying to extend a standard VO for the first time.

I created my project in JDevelopr.

I imported successfully files into a test env.

generated customall.jar

when trying to see the page where I do expect to see my extension I'm getting an error

oracle.jbo.InvalidOperException: JBO-26036: Recursive substituion for <mycustomVO>

I found a doc telling

JBO-26036: The configuration of meta object {0} causes recursive substitution.
Cause: An attempt was made to set up meta object substitution that leads to recursion. For example, consider a substitution where C substitutes B, and B substitutes A, and A substitutes C. This results in a recursive substitution and will cause this error.