Hi Jonathan,
Have few queries
1. Are you able to validate the transformation file successfully?
2. If answer to point 1 is yes, than are you using CPMB/LOAD_INFOPROV_UI to load the data?
3. Is there data load happening to the source cube?
4. Does the user have the appropriate authorization to perform this task?
Answer to above questions may lead to the root cause of the problem.
Hope this helps.
Regards,
Kalyan.