1. Addition to existing stock is NOT allowed to implement FIFO concept . Because FIFO is carried out based on the goods receipt date , if there is an addition to existing stock ,the goods receipt date of the quant being added is lost when the quants are merged . This means that the quant always refers to the goods receipt date of the First putaway .
Addition to existing stock is NOT allowed to implement FIFO concept . (不允许FIFO的先进先出)
2. Mixed storage (Mixed storage is allowed to implement FIFO concept . (允许FIFO的先进先出）)
if more than one quant is to be stored in one storage bin , you have to allow mixed storage for the storage type .
WMS indicators in SAP (indicators for storage type)
原文：http://www.cnblogs.com/jefflu2012/p/4236573.html