Beginner: Trouble Creating And Populating Tables

Hey guys, I'm an old DevShed member, but my old account isn't working for some reason, so I had to recreate..

I've recently decided to learn MS SQL, and having some trouble with creating and populating tables. Using MS SQL Express 2005.

Heres the code, I keep reading through my notes on how to do it, but I cant see what I'm doing wrong. This is my first attempt at it, so there may be more wrong that I think.


Code:


drop table Property_rental;
drop table Property_type;
drop table Property_owner;
drop table Staff;
drop table Tenant;
drop table Tenant_category;

create table Tenant_category
(TCATID SMALLINT PRIMARY KEY NOT NULL,
TTYPE NVARCHAR(15))
;
create table Property_type
(PTYPEID SMALLINT PRIMARY KEY NOT NULL,
PTYPE NVARCHAR(20) NULL)
;
create table Property_owner
(POWNERID SMALLINT PRIMARY KEY NOT NULL,
FNAME NVARCHAR(20) NULL,
SNAME NVARCHAR(20) NULL,
CONTACT NVARCHAR(15) NULL,
ADDR NVARCHAR(50) NULL)
;
create table Staff
(STAFFID SMALLINT PRIMARY KEY NOT NULL,
FNAME NVARCHAR(20),
SNAME NVARCHAR(20),
CONTACT NVARCHAR(20))
;
create table Property_rental
(ID SMALLINT PRIMARY KEY NOT NULL,
PTYPEID SMALLINT NOT NULL,
STAFFID SMALLINT NOT NULL,
POWNERID SMALLINT NOT NULL,
CONSTRAINT Prop_Type_fk FOREIGN KEY(PTYPEID) REFERENCES Property_type(PTYPEID),
CONSTRAINT Prop_Staff_fk FOREIGN KEY(STAFFID) REFERENCES Staff(STAFFID),
CONSTRAINT Prop_Owner_fk FOREIGN KEY(POWNERID) REFERENCES Property_owner(POWNERID))
;
create table Tenant
(TENANTID SMALLINT NOT NULL,
TCATID SMALLINT NOT NULL,
ID SMALLINT NOT NULL,
FNAME NVARCHAR(20),
SNAME NVARCHAR(20),
CONTACT NVARCHAR(20),
COMMENTS NVARCHAR(20),
CONSTRAINT Ten_Cat_fk FOREIGN KEY(TCATID) REFERENCES Tenant_category(TCATID),
CONSTRAINT Ten_Prop_fk FOREIGN KEY(ID) REFERENCES Property_rental(ID),
CONSTRAINT Ten_pk PRIMARY KEY (TENANTID, TCATID, ID))
;




Error messages I'm getting;


Code:


Msg 547, Level 16, State 0, Line 55
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 56
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 57
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 58
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 59
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 60
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 61
The INSERT statement conflicted with the FOREIGN KEY constraint "Ten_Prop_fk". The conflict occurred in database "master", table "dbo.Property_rental", column 'ID'.
The statement has been terminated.

Msg 547, Level 16, State 0, Line 82
The INSERT statement conflicted with the FOREIGN KEY constraint "Prop_Staff_fk". The conflict occurred in database "master", table "dbo.Staff", column 'STAFFID'.
The statement has been terminated.