Import DSA certificate to GW Sandbox To import the the smp.ss2.cer into the Gateway (GW) Sandbox system: Navigate to TCode: STRUSTSSO2 and import the certificate to System PSE. Click Add to Certificate List. Figure 1. Import Certificate Click Add to ACL and enter the details. Note: You will use the same details in the SMP Configurations. Figure 2. Import Certificate 2 Click Save.