43 C.F.R. § 3173.19
Effective date of a commingling and allocation approval
(a) If the BLM approves a CAA, the effective date of the CAA is the first day of the month following first production through the FMPs for the CAA.
(b) If the BLM approves a modification, the effective date is the first day of the month following approval of the modification.
(c) A CAA does not modify any of the terms of the leases, units, or CAs covered by the CAA.