At production start, the system automatically sets all materials to price determination control 2, which will not be included in ckmlcp processing.

And when you change the price determination from 2 to 3 via CKMM, the period status will be automatically changed to "new object", for which there's no need to do the period end closing.

Anyway, if your materials is with status 30 for the previous periods, the most convenient solution is to manually set it to 70 for the last period. You may achieve this via program MLHELP_SET_PP_STATUS_70. You only need to do it for the period before last period. Then you can go ahead with the normal period end closing process for the previous period.

Material period status list:
00 Undefined
01 New Objects
10 Period Opened
20 Price Change Completed
30 Quantities and Values Entered
31 Values Entered
40 Price Determined (Single-Level)
50 Price Determined (Multilevel)
60 Closing Entry Reversed
70 Closing Entry Completed
05 Period Without Stock Opened