Resolving Cyclical Reference in Referential Relationships

I'm designing a small SQL Server Compact Edition database and am attempting to enforce referential integrity. The database is a simple backend for a small desktop application that functions as an account/password manager. Here are my relationships: Now, I'm attempting to set CASCADE delete rules like so: category.id ---> account.category_id account.id ---> credential.account_id category.id ---> field.category_id field.id ---> credential.field_id After adding the first 3 relationships, I get an error while adding the 4th (field ---> credential): *The referential relationship will result in a cyclical reference that is not allowed.* I'm struggling to determine why this is happening and how to fix it. Any ideas?