If you create your own business roles and you want to give them authorization for invoices you have several options:

1) Display authorization:
To grant display authorization to users with the business role, please assign business catalog SAP_MM_BC_INV_DOC_DSP_PC to the business role.

2) Park authorization:
To grant display and hold/park/park as complete authorization to users with the business role, please assign business catalog SAP_MM_BC_INV_PARK_PC to the business role.

3) Post authorization:
To grant post, display and hold authorization to users with the business role, please assign business catalog SAP_MM_BC_INV_PROCESS_PC to the business role.
Alternatively you can assign business catalog SAP_MM_BC_INV_PROCESS_MC to the business role. The difference in the two catalogs are the apps the authorizations are derived from. In the PC catalog the authorization is derived from the app 'Create Supplier Invoice' in the MC business catalog the authorization is derived from the app 'Create Supplier Invoice - advanced' which is basically transaction MIRO.

4) Release authorization:
To grant release and display authorization to users with the business role, , please assign business catalog SAP_MM_BC_INV_RELEASE_PC to the business role.
Users with this business role can then release invoices but not park or create them.