SAP NWBC Functional Standard SAP Roles EHP6

Gurus,

Does anyone know which functional (PP, MM, PM, QM, SD, LE, WM) roles should we or normally assign to user as the back end system. A quick answer would be really appreciated... A good link or Roles list would be great...I have found some roles when I search *NWBC* assigned those but did not worked because use was not able to see the functionalities on the NWBC client screen then I have create some MENU based roles and assigned and it worked....But I like to know the proper roles for each functional either single or composite role....Thanks Gurus😉