You can only use this function if you use
As well as reclassification for articles and material groups, a new, simplified reclassification option has been developed for Release 4.6C.
This new transaction allows you to reclassify a Retail article using the target material group and, if required, the target characteristics profile.
You will find further information in the SAP Retail documentation (SAP Library -> Logistics -> SAP Retail) under Master Data -> Material Group -> Article Reclassification