2077765 - Failed to migrate IQ12.7 database to IQ15.x with an error

When you migrate IQ 12.7 database to IQ 15.x via iqunload, there are cases where the below error message will be reported.

Error message
***** SQL error: Right truncation of string data

Error Sample
$ iqunload -au -c "UID=DBA;PWD=SQL;DBF=xxxxxx"
Sybase IQ Unload Utility Version 15.4.1.3038
Connecting and initializing

=============================================================
IQ server starting with:
      1 connections         (       -gm )
     14 cmd resources       ( -iqgovern )
    127 threads             (     -iqmt )
    512 Kb thread stack size   (   -iqtss  )
  65024 Kb thread memory size ( -iqmt * -iqtss )
      2 IQ number of cpus  ( -iqnumbercpus )
      0 MB maximum size of IQMSG file ( -iqmsgsz )
      0 copies of IQMSG file archives ( -iqmsgnum )
=============================================================

=============================================================
IQ server starting with:
      1 connections         (       -gm )
     14 cmd resources       ( -iqgovern )
    127 threads             (     -iqmt )
    512 Kb thread stack size   (   -iqtss  )
  65024 Kb thread memory size ( -iqmt * -iqtss )
      2 IQ number of cpus  ( -iqnumbercpus )
=============================================================

Licensing error:  Code =  -201.
Wrapping iqmsg: Disabled.
Wrapping iqmsg: Disabled.

=============================================================
IQ server starting with:
      1 connections         (       -gm )
     14 cmd resources       ( -iqgovern )
    127 threads             (     -iqmt )
    512 Kb thread stack size   (   -iqtss  )
  65024 Kb thread memory size ( -iqmt * -iqtss )
      2 IQ number of cpus  ( -iqnumbercpus )
      0 MB maximum size of IQMSG file ( -iqmsgsz )
      0 copies of IQMSG file archives ( -iqmsgnum )
=============================================================

***** SQL error: Right truncation of string data

SAP IQ 15.x

KBA , BC-SYB-IQ , Sybase IQ , Problem