Transport of projects in Solution Manager

Hello dear experts,

I hope somebody can help me with the following problem:

I followed the instructions of SAP how to transport projects between systems:

"

1. 1.  Select the project in the project overview.
2. 2.  Choose Transport Project or Project → Transport.
3. 3.  Specify the transport scope in the following dialog box. To transport the project without project documentation, deselect the With Notes indicator. The project documentation is transported by default.
4. 4.  Specify a transport request or create a new one.
5. 5.  Confirm your entries.

"

So first I created a new transport request (transport of copies) in transaction SOLAR_PROJECT_ADMIN:

When I try to release this transport request in SE01 it will be cancelled:

Error log:

The error log isn't really usefull for me and I don't find a snote for it.

Maybe somebody else was dealing the same problems or knows a better way to transport projects between SolMan systems.

Thanks a lot and greetings from Germany

Martin Kläse