SAP Message AY070 - Transaction type &1, session &2 is not supported by the system

Diagnosis A program error has occurred:you entered transaction type &V1& and session &V2&. This combinationis not supported by the system. System Response Processing is interrupted. Procedure The transaction type 'A' (Display) is only possible in session 1. Insessions 6, 7, 8 you can only use transaction type 'V' (change). Please notify your system specialist.