(1) When an employer makes a payment to a program under Title 50, 50A, or 50B RCW, the full amount of the payment will be allocated to the program listed by the employer. 

(2) If the program for which the payment is intended is not clear, the department will make a reasonable attempt to contact the employer to determine how the payment should be applied.

(3) If the department is unsuccessful in contacting the employer, the department will investigate if the employer has any outstanding debts to any of the programs referenced in subsection (1) of this section. If money is owed to one or more programs, then the payment will be deposited in the following order of priority:

(a) To Title 50 RCW, if money owed to this program; then

(b) To Title 50A RCW, if money owed to this program; then

(c) To Title 50B RCW, if money owed to this program.

If an employer has a credit within one program, the credit can only be applied to another program under Title 50, 50A, or 50B RCW, at the request of the employer.