You need to change the rate source from resource to role if you wanted to use roles rate as I explained to you before. Below link is the forum that explain further
Roles is not the same as OBS. OBS is the organizational breakdown structure which is also used for granting security access in P6 while roles is use to represent high level resource which normally used in pre-planning stage if detail resource are not available and being replace by resource during detail planning.
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19 yearsRE: Role Price/Unit not able to get in Resources
Haresh,

You need to change the rate source from resource to role if you wanted to use roles rate as I explained to you before. Below link is the forum that explain further
Cost Coding of activities Post #29
Roles is not the same as OBS. OBS is the organizational breakdown structure which is also used for granting security access in P6 while roles is use to represent high level resource which normally used in pre-planning stage if detail resource are not available and being replace by resource during detail planning.