You are in the midst of configuring the SOLMAN_SETUP. To be exact, you are in the Managed Systems Configuration – Maintain Users phase for JAVA system.
User j2ee_admin is not allowed to perform this request. Check SAP Note 1647157.
Of course, you need to refer to SAP Note 1647157 – How to Set up Access to the SPML Service on AS Java.
Also, please refer to How to Create New Role in SAP J2EE (JAVA) to get rid of the error. By the way, from the step provided, the newly created role is assigned to J2EE_ADMIN which is not recommended. You may need to create a new user and assigned the role on top of it.
The error was taken from SAP Solution Manager 7.1 SPS 12.