Yes, I have got this error before. This happened to me when I didn't disable a business object in the clistobjedit class.

If you have a child object and use the clistobjedit class and add your own business object on the form, you need to be sure to disable the business object contained in the clistobjedit clast (clistobj).

This error didn't occur prior to version 7.

I hope this helps.

Bob