You can use the authorization object P_PCLX, HR: Clusters, during the authorization check for access to PCLX HR files (x = 1, 2, 3, 4) as long as these accesses are via the PCLX buffer (interface supported by HR).
The possible values for the area indicator are the fixed values of the RELID_PCL domain. The fixed values and definitions of what they mean are stored in the T52RELID table (transaction PECLUSTER).