Hi Toni
how it is possible to use more than one SPDD transport during the upgrade?
You can open more then two transaction code SPDD, but the first one will allow you do the notes / reports /Programs corrections read and do the changes, but the second and 3th SPDD only in the display mode(not for any changes).
The SUM-Tool allows only one SPDD transport to select??
It depend on your landscape. you can create transport request one or more then one based on your business need. Normally we can create a single transport if the all three systems are sync.
BR
SS