When you implement LIFO valuation in the R/3 System, you generally want to create layers for earlier settlement periods. You have the following options:
If you have previously carried out LIFO valuation in another system, your system administrators can copy the layers from that system to the R/3 System.
If you use LIFO valuation for the first time with the R/3 System, you can derive the so-called base layer from old stock data in the material master record.
Preparation of LIFO Valuation