The FIORI Apps Library does not list an app for t-code MRN1, only for MRN0 and MRN9 , Please have a look at Scope Item scrip BEJ Inventory Valuation at Year End. Alternatively, If you check in the App Finder within your Q system you could also find t...
i would say the standard cost solution provided as scope item BEG is pretty robust and a best practice; There are many many reports already available to evaluate cost by cost component, Maybe Claire can elaborate a bit what she is trying to report on...