So this I have found so far: It is optional to have one or two SLD when upgrading PI (see How-To Guide: Decision making factors when moving to SAP NetWeaver Process Integration 7.3). When using one SLD you can only have one ABAP BS per TS. What puzzles me still is that the BS then still is configured in the SLD to belong to the old Integration Server. When will be a good time to switch it to the new PI keeping in mind that the PI system will run in parallel for six months?
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