Non-mapped instance variables result in errors during SQL update generation
If you attempt to generate an SQL update command using the generateSQLUpdate:instVarName:newValue:table:columns:keys:
method for an instance variable that is not part of the receiving object's
column mapping, you will receive the following error:
GemStone: Error Nonfatal
An indexable object or NSC anArray() was referenced with an index 2 that
was out of range.
Error category: [GemStone] Number: 2003 Arg Count:2
Arg 1: an Array
Arg 2: 2
Verify that instance variables are column mapped before generating any
SQL update statements for them.