I have a form which (Ppl-Sponsors - in the ERD below) and I need to validate it so that it is a unique entry.

Not allowed:

• Same Person & Same Company & Different Sponsorship
• Same Person & Different Company & Same Sponsorship
• Same Person & Same Company & Same Sponsorship
• Same Person & More than 3 different sponsorships
• Same Person with no Main Sponsor

Thanks in advance

Pete