Exporting Dimension Elements
By default, the Export IGES facility exports MicroStation PowerDraft dimensions as IGES dimension entities. To override this, the Break Dimensions option must be selected in the IGES Export Settings dialog (from the Export IGES File dialog, choose Settings menu > General…).
When the Break Dimensions option is selected, dimensions are exported as their constituent elements (lines, text, etc.). This results in the same output as generated with v5.0.