Maintaining Authorization Data 
Use
You can maintain the authorization data with the Merge and maintain authorizations
function. Maintaining the data includes completing the proposed authorization values entered by the system for the SAP transactions contained in the portal role.
Prerequisites
Procedure
To maintain the authorization data:
The screen for maintaining the role authorizations is opened. The proposed values are derived from the transactions in the menu structure.

You can also call the screen for maintaining authorization data with Transaction PFCG on the Authorizations tab. If you call the screen from this transaction, however, not all of the data needed for maintaining the authorization roles is displayed.
You should therefore always start maintenance of the authorization roles from Transaction WP3R.