Trying to fill table with default value - sql

Question

I have 2 tables, Suppliers, and Products. I'm trying to fill them with random info.
Table Products, Column supplier_id. I set this column default value to -1.
I'm getting error on the line where I'm trying to insert default value in given column.
Check the code below, error msg at the bottom of the post.
SUPPLIERS:
CREATE TABLE Suppliers
(
id int primary key identity(1,1),
"name" nvarchar(50) not null,
telephone nvarchar(50) default 'N/A',
"address" nvarchar(50) default 'N/A'
)
INSERT INTO Suppliers (name,telephone,address)
values ('Supplier 1', '021-555-333', 'Jovana Petrovica 72, Beograd 11000'),
('Supplier 2', '021-555-333', 'Branka Radicevica 13, Zrenjanin 23000'),
('Supplier 3', '021-555-333', 'Bulevar Oslobodjenja 30A, Novi Sad 21000')
PRODUCTS:
CREATE TABLE Products
(
id int primary key identity(1,1),
"name" nvarchar(50) not null,
price float default 0,
supplier_id int default -1,
foreign key (supplier_id) references Suppliers(id) ON DELETE SET DEFAULT
)
INSERT INTO Products (name, price, supplier_id)
values ('Product 1', 800, 3),
('Product 2', 1300, 1),
('Product 3', 230, 2),
('Product 4', 570, 3),
('Product 5', 1225, 2);
INSERT INTO Products (name, price)
values ('Product 6', 80); // I read online this is the way to insert default values (?)
Error msg:
The INSERT statement conflicted with the FOREIGN KEY constraint "FK__Products__suppli__03F0984C". The conflict occurred in database "Tehna", table "dbo.Suppliers", column 'id'.
The statement has been terminated.

Answer 1

I guess that default 'supplier_id' should be greater than 0 or null, because it's related to 'id' in Suppliers which is primary key and also an integer