Cannot add or change records

I'm designing a database structure wherein I like to apply the concept of inheritance.There's a base tables and derived tables in which the relationship is one-to-one. I'm quite new as of how could this be achieved and how the data are to be fed to the tables because I'm getting errors I can't solved.

I'm wondering if I'm on the right track doing this.

Here's the design view of the database:

I get the error of

You cannot add or change a record because a related record is required in the table **PatientRegular**

In which case the table I'm on currently working?

And the relationship view:

What is the right way to do that? I want to inherit all those similar fields to another table?

Update

Either way, I cannot also insert new data in the base table (I must be in a wrong track)