Ala. Code § 45-37A-51.196
In the event of the retirement of a police officer or a firefighter from a supplemental pension system, as established by Subpart 1, with 20 or more but less than 30 years of credited service under the system, this system shall receive from the supplemental pension system each member's monthly contribution payments required to be paid from the supplemental pension system to this system from the police officer or firefighter's retirement date thereunder until the date he or she would have been entitled to retire under this system with 30 years of credited service had such police officer or firefighter continued to serve without retiring and without interruption as a participant in this system. The city shall then pay the employer's required contributions pursuant to Section 45-37A-51.192 from its general fund or other appropriate funds to the fund within 30 days from the date of receipt of the member's monthly contribution payments from the supplemental pension system.
Ala. Code § 45-37A-51.196 (1975)