1830987 - ITS Note cannot be implemented in non-unicode systems

When trying to implement an ITS (BC-FES-ITS) related SAP Note one of the following error messages appears in transaction SNOTE:

• Conversion error: Target language: E, Error: CX_SY_CONVERSION_CODEPAGE,
  Text: Cannot convert character sets for one or more char
• Format of correction instructions ...; unable to read corr. instruct.
• Format der Korrekturanleitung ... unbekannt; K.Anleitung nicht lesbar
  Meldungsnr. SCWN409

In addition the following error message is shown when trying to display the affected MIME object via transaction SE80:
  Conversion Error. Incorrect Display. Watch Long Text.
  Message no. W3_TOOL121

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• SAP Netweaver
• Internet Transaction Server (ITS)
• This problem does not occur in Unicode systems!
• Affected SAP system has Support Package level lower than the one listed below:

Support Packages	Release	Package Name
SAP_BASIS	640	SAPKB64028
SAP_BASIS	700	SAPKB70024
SAP_BASIS	701	SAPKB70109
SAP_BASIS	702	SAPKB70208
SAP_BASIS	710	SAPKB71012
SAP_BASIS	711	SAPKB71107
SAP_BASIS	720	SAPKB72005
SAP_BASIS	730	SAPKB73003

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver Application Server for ABAP 7.1 ; SAP NetWeaver Application Server for ABAP 7.2 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver Application Server for ABAP 7.1 ; SAP enhancement package 2 for SAP NetWeaver 7.0

SAP GUI for HTML, WebGUI, 0120031469 410000920389 0001, 0120061532 41 0001326582 0004, METHOD CONVERT_X_STRING_TO_CHAR CL_IAC_HELPER_CONVERSIONS=====CP, METHOD CONVERSIONS_FROM_X_STREAM CL_IAC_HELPER_CONVERSIONS=====CP, METHOD CONVERT CL_IAC_HELPER_CONVERSIONS=====CP, METHOD GET_CONTENT CL_IAC_MIME===================CP, FUNCTION CLM_CWB_IAMU_GET SAPLIAC_CLM_CWB, METHOD READ_FROM_REPOSITORY CL_CWB_OBJECT_IAMU============CP, METHOD READ_FROM_DB CL_CWB_OBJECT_SINGLE==========CP, METHOD GET_XVERSIONABLE_OBJECT CL_CWB_OBJECT_SINGLE==========CP, METHOD GET_XVERSIONABLE_OBJECT CL_CWB_OBJECT_IAMU============CP, METHOD COPY_DATA CL_CWB_OBJECT_IAMU============CP, METHOD CREATE_COPY CL_CWB_OBJECT_SINGLE==========CP, BC-FES-ITS, BC-FES-WGU , KBA , BC-FES-ITS , SAP Internet Transaction Server , BC-FES-WGU , SAP GUI for HTML , BC-DWB-TOO-WAB , Web Application Builder , Problem