You want to check if single sign on (SSO) from sap portal to abap is working
Log on to portal
Try to run an abap transaction in portal by followings.
Log on to portal -> System Administration – > Support – > Test and Configuration Tools -> SAP Application – > SAP Transaction
System: Choose system to be tested
Transactioncode: for example sm50
SAP-GUI-Typ: SAP GUI for Windows
and press “Go”.
SSO is working, if you can run the transaction without entering user and password.