Validation Rule

[noob123]

Help Needed. I need a validation rule where a Horse cannot be added that does not already have a Dam and Sire existing in the database unless either or both are not known. All i have got atm is ([Sire] IsNull) And ([Dam] Is Null) However it wont accept this due to it being in web (HTML) format. I can't force referential integrity either due it being in web format as well.

[rpeare]

If you're still working on this problem, can you supply a copy or sample of your database