>Thank for your help, but I did it and it doesn´t work, because the validations rules get lost.
>Did you got it..????

Hmmm- GenDBC preserves the validation rules for me...

Do you mean the relaionships?? If so, then you are right- just deleting tags and reindxing does not restore them. There is a tool here called DIRT that does this quite nicely though. Check in the Files section.