2758985 - Query hits non-fatal error at dfe::TypeCheck - -SAP IQ

Customer's several distinct queries  hit Non-fatal error.  All tables check clean in verify mode

>> IQmsg & Stack ;

   I. 06/19 14:49:34. 0000329680     ********************************************************
   I. 06/19 14:49:34. 0000329680     **
   I. 06/19 14:49:34. 0000329680     **       Non-Fatal IQ Internal Error Detected
   I. 06/19 14:49:34. 0000329680     **       at dflib/dfe.cxx:247  on thread 75817 (TID 99)
   I. 06/19 14:49:34. 0000329680     **       Error detected for expression: HV(@p4 = NULL) [0x0x255adfea8, hn:680, qb:0]
   ...
   ...
  
   ===== Thread Number  ... =====
    .. 
    .. .df_Exception::ThrowException  ..
    .. .dfe::TypeCheck                ..
    .. .dfe_HDBValue::TypeCheck       ..
    .. .dfe_HDBValue::TypeCheck       ..
    .. .df_Evaluable::DepthFirstTypeCheck  ..
    ..                                     ..
    .. .df_Heap::GenerateDF                ..
    .. .opt_QueryTree::AttachQueryNodesRestrictions  ..
    .. 
    .. .opt_Select::GenerateDFEs  ..
    .. .opt_Driver::GenerateTree  ..
    .. 
    .. .UIQDML_OpenCursor ..
    ..

SAP IQ16.0 SP11

815631, dfe::TypeCheck ,TypeCheck ,  DepthFirstTypeCheck, , KBA , BC-SYB-IQ , Sybase IQ , Problem