Hi Markus,
I have same error with SUM in MSSQL Server 2012:
1 ETQ233 Calling function module "SUBST_CHECK_BATCHJOB" by RFC
2 ETQ373 parameter "JOBNAME" = "DBCLONE3"
2 ETQ373 parameter "JOBCOUNT" = "14442700"
2 ETQ373 parameter "IV_VERIFY" = " "
1 ETQ234 Call of function module "SUBST_CHECK_BATCHJOB" by RFC succeeded
4 ETQ010 Date & Time: 20160506144829
2 ETQ373 parameter "JOBSTATUS" = "A"
2 ETQ374 parameter "RC_CHECK" = "0"
2 ETQ373 parameter "JOBENDDATE" = "20160506"
2 ETQ373 parameter "JOBENDTIME" = "144808"
2EETQ262 Batchjob "DBCLONE3" aborted
1EETQ399 Last error code set is: Batch jobs (DBCLONE1) may still be running, check SM37 and SM21 for details
1EETQ204 Upgrade phase "DBCLONE" aborted with severe errors ("20160506144829")
Database is in SIMPLE Mode and has 20GB(LOG).
3 JOBS running then cancelled.
Any clue?