The staff member's role includes the privileges:
PRODUCT_MANAG_CONFIGURE PRODUCT_MANAG_MODIF_PLANS PRODUCT_MANAG_VIEW_PLANS
which by description shall be enough for service plans editing. Attempt to access the list of the service plans when logged in with this staff member results in the error:
System Error No access rights granted to method
The issue is considered as a bug, its id is #PBA-53299 ("It is not possible to open the list of Service Plans without the CONFIG_STORE privilege.")
Update to PBA 5.5.4 or above. If update is not possible at the moment, add the privilege
CONFIG_STORE to the staff member's role.