HI Seval
Errors in COGI must be fixed before end of month - this is a daily activitie.
Problems not fixed in the same month will impact mainly in CO side (cost of producto) - affects the Production Order Cost.
Each material in COGI is a problem do COPC (Product Cost) and MRP (material possibly used but not informed in the system).
And if you are using Material Ledger, you'll facing more CO problems.
Rule: Each problem in COGI must be fixed until end of the day.