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Configuring System Messages 
If an SAP R/3 system with Release 4.x is integrated in the system landscape of the portal, the user is logged on again each time he or she accesses the SAP R/3 system for technical reasons. With single sign-on using logon tickets, the portal user is authenticated in the back-end system without further logons, but the SAP R/3 system displays the window with the system messages each time.
Below you can find information about how to configure the SAP R/3 system so that the system messages are only displayed once per calendar day.

No configuration steps are needed in SAP R/3 systems with Release 6.10 or higher.

See also Note 301563.
You must perform the following steps to configure your system:
...
1. Create and activate database table TEMSGU.
2. Create an index for table TEMSGU (optional).

This is recommended for larger systems with a number of users as it reduces the access times to table entries.
3. Change and activate the report and the function modules
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a. LSM02DEF
b. SM02_DELOLD_MESSAGE
c. SM02_GET_UNREAD_MESSAGE
d. SM02_SET_LAST_USREMSG_ID
Once the changes have been activated, the system messages are only displayed once per day.