composite foreign key add fails - mysql

Question

I have got 4 tables here:
CREATE TABLE paper (
id VARCHAR(20) PRIMARY KEY,
name VARCHAR(30)
) ENGINE =INNODB;
CREATE TABLE subscriber (
id VARCHAR(10) PRIMARY KEY,
name VARCHAR(20),
address VARCHAR(30),
suburb VARCHAR(20),
state VARCHAR(3),
postcode VARCHAR(4))
round_id INTEGER NOT NULL,
FOREIGN KEY (round_id) REFERENCES round (id)
ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE = INNODB;
CREATE TABLE current_order (
paper_id VARCHAR(20),
subscriber_id VARCHAR(10),
PRIMARY KEY (paper_id, subscriber_id),
FOREIGN KEY (paper_id) REFERENCES paper (id)
ON UPDATE CASCADE ON DELETE RESTRICT,
FOREIGN KEY(subscriber_id) REFERENCES subscriber (id)
ON UPDATE CASCADE ON DELETE RESTRICT)
ENGINE = INNODB;
CREATE TABLE receipt (
id INTEGER PRIMARY KEY AUTO_INCREMENT,
receipt_date DATE,
paid_till_date DATE,
paper_id VARCHAR(20),
subscriber_id VARCHAR(10))
ENGINE = INNODB;
Now table paper has a primary key ID, it is referenced by paper_id in table current_order.
Table subscriber has a primary key ID, it is referenced by subscriber_id in table current_order.
Tabe current_order has a composite primary key (paper_id,subscriber_id).
So these three table has been linked together through the foreign key relationship.
If I want to have the last table receipt linked with these three table, how do I do that? My idea was to
1:set a compound foreign key (paper_id,subscriber_id) referencing to the compound primary key (paper_id,subscriber_id) in table current_order.
2:set two single foreign key (paper_id) and (subscriber_id) referencing to (paper_id) and )subscriber_id) in table current_order separately.
Neither method worked and it came up with error 1452:cannot add or update child row.
So I am really desperate to know what is the proper way to set relationship between table receipt and table current_order?
here is the E-R Digram:
E-R DIGRAM
There is two links between table receipt and table current_order and I am required to set relationship according to that.

Answer 1

i'm not a mysql expert but i would try this:
CREATE TABLE receipt (
id INTEGER PRIMARY KEY AUTO_INCREMENT,
receipt_date DATE,
paid_till_date DATE,
paper_id VARCHAR(20),
subscriber_id VARCHAR(10),
FOREIGN KEY (paper_id,subscriber_id) REFERENCES current_order (paper_id,subscriber_id)
ON UPDATE CASCADE ON DELETE RESTRICT)
ENGINE = INNODB;
does it works?