2575109 - ERROR: Conversion for table ATAB detected

There is an upgrade using the Software Update Manager, but the following error occurred during phase MAIN_SHDRUN/RUN_RSPTBFIL_PDIST:

• Log file: SAPupConsole.log

*ERROR*:

 Batchjob RSPTBFIL on shadow system failed.
 Detected the following errors:
# /SUM/abap/log/RSPTBPOD.<SID>:
 4 ETG859 ["MODEFLAG"] "AT52T" -> "MODEFLAG" = "F"
 4 ETG859 ["MODEFLAG"] "AT56R" -> "MODEFLAG" = "F"
 4 ETG859 ["MODEFLAG"] "AT72T" -> "MODEFLAG" = "F"
 4 ETG859 ["MODEFLAG"] "AT81T" -> "MODEFLAG" = "F"
 4 ETG859 ["MODEFLAG"] "AT90T" -> "MODEFLAG" = "F"
 2EETG012 "[MODEFLAG]" "ERROR: Conversion for table ATAB detected"
 2EETG012 "[MODEFLAG]" "ERROR: Please contact SAP-Support!"

Checking the Runtime Object for table ATAB via SE11 (Utilities → Runtime Object → Check), the following inconsistency can be seen:

• Software Update Manager (SUM)
• Unicode system

VARDATA length, Database Object inconsistent, ATAB, "ERROR: Conversion for table ATAB detected" , KBA , BC-DWB-DIC-AC , ABAP Dictionary Activation and Conversion , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem