For Territories with expired date need to run below mentioned reports in SAP GUI to reactivate to system default or evergreen date and use it for future.
Before specifying a particular territory we need to run this report and to set expired flag
2. CRM_TERRMAN_TERR_REACTIVATE :
In this report we can specify the range of territories which needs the expired date needs to be changed to evergreen date
Once we specify the range and execute the end date will be set to evergreen date by default.
3.SAP CRM WEB UI :
Below screen shot shows the territories with end date :
After running the above mentioned reports territory T332 “Valid To” has been changed to 12/31/999
4.SAP Note :
SAP has recommended this note
2151085 – Unable to set new validity period for deleted territory.
Please do let me know if you want to add some more points to this topic.