The error Messages recorded in the CreateTSMedia.log were:
1. Create a new package (e.g. OSD Script v2.0) and distribute ist Content to a DP
2. Create two copies of the Task Sequence (e.g. TSCopy1 und TSCopy2)
3. Edit the TSCopy1 so that the failing "Run Command Line" TS Steps use the OSD Script v2.0 package.
4. Delete the failing "Run Command Line" TS Steps from the TSCopy2
5. Copy the failing "Run Command Line" TS Steps from the TSCopy1 and paste them to the TSCopy2
6. Customize the pasted "Run Command Line" TS Steps so that they use the OSD Script v1.0 package again
7. Save the TSCopy2
8. Run "Create Task Sequence Media" from the TSCopy2