Antonio,

>Thanks for the code clips. I just realized that I copy-pasted directly from the documentation (version 1.3) and it had a mistake. Here's what shows on the documentation:
>
>DataSet ds = ((mmBusinessObject)this).HostObject.GetCurrentDataSet();
>
>Now my validation is working.

Glad to hear it, and thanks for the heads up on the misplaced paren!

Regards,