[INV] Cost Group - Disabled in the Inventory Organization Setup

For setting new organization for Inventory Child, Organization -> Inventory Organization Setup -> Inventory Information -> Costing Information. Default Cost Group field is disabled, but the Valuation Accounts field are mandatory. Once I perform a Save action, Default Cost Group field was updated with some value, e.g. CG-xxxx, where xxxx denotes any numeric number. This is the new cost group that were create automatically. Prior to R11i, Common cost group would be defaulted.

DO REMEMBER to test your costing after any new inventory org setup as Cost Group is something new in R11i.