B4210440 Get Price History Data - Pricing Category Level Flag ?

Hello Oracle,

Request your help.

Requirement:  I use B4210440 Get Price History Data in our customization in P551002/ (P421002) to read Price History Cache.  This BSFN retrieves a flag Pricing Category Level with values "1" & "3".  Can you help me understand, from where does BSFN get "1" or "3".  I searched the C code and it gets it from as below.  But still not clear which table or set up or logic??

idReturn = GetSalesOrderLineBusinessData(lpBhvrCom, lpVoid,

                                            (LPCALLMAP *)NULL,

                                            (int *)NULL,

                                            (PJDELIST *)NULL,

                                            (LPVOID)&dsLineBusData,

                                            _J("D4210440B"),

                                            lpDS->szSessionKey,

                                            &lpDS->mnLineKey,

                                            &lpLineData)

Does Pricing Category Level flag have any relation to Foreign order ?

Does  Pricing Category Level flag  value changes during order entry ?