Symptom
You are executing a system refresh and wanted to retain the PSE file in the STRUST.
Solution
EXPORT PSE FROM STRUST
1. Execute transaction code STRUST. As an example, you want to export SYSTEM PSE file. Double click and go to PSE > Export. A dialog box will prompt to save the export PSE file.
IMPORT PSE TO STRUST
1. In transaction code STRUST. Click on File and from the dialog box prompted, locate your previous saved PSE file. You will see the PSE details on the right panel side.
2. Once verified, go to PSE > Save As to apply the PSE.
Reference
SAP Note 1473710 – STRUST: How to Export/Import a PSE from/to STRUST
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