2544307 - (EXP) The spot check of the Unicode Conversion Preparation failed.

During a conversion to Unicode the System Copy export aborted with errors like below:

(EXP) ERROR: The spot check of the Unicode Conversion Preparation failed.
(EXP) ERROR: The following error is returned:
(EXP) ERROR: The length rule 'Unicode=2*NonUnicode' is violated for test table CDPOS: UC=774, 2*NUC=1548

or

(EXP) ERROR: The spot check of the Unicode Conversion Preparation failed.
(EXP) ERROR: The following error is returned:
(EXP) ERROR: Expected 3 rows from this SELECT, got only 1:
(EXP) ERROR: Expected 3 rows from this SELECT, got only 1:

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• SAP Systems based on SAP NetWeaver AS ABAP
• Non-Unicode
• Unicode Conversion preparation 

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

Unicode Migration, Unicode Conversion, Migration Monitor, MigMon, DDNTT_CONV_UC, DDNTF_CONV_UC, DDNTT, DDNTF, com.sap.inst.migmon.LoadTask run Unloading of export package is interrupted with R3load error, Program 'Migration Monitor' exits with error code 103, The spot check of the Unicode Conversion Preparation failed , KBA , BC-I18-UNI , Unicode , BC-INS-MIG , OS/DB Migrations with SWPM and DB refresh , Problem