true, if the column is a reference; otherwise, false.
Remarks
When you load data to a reference column, SalesforceLoader takes a value of the ID field of the referenced Salesforce object, for which the referenced External ID field is equal to the specified value, and asigns it to the target column.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2