By default, when you rename a column or parameter in a source map or information object, the name change is propagated to any dependent information objects as long as the column name in the dependent information object is not modified. Column names that appear in expressions, including computed column and filter expressions, are also updated. Information Object Designer does not check for column name duplication in a dependent information object. When you compile the information object, column name duplication is reported as an error.
By default, when you delete a column or parameter in a source map or information object, the deletion is not propagated to dependent information objects. If you override this behavior, the deletion is propagated to any dependent information objects as long as the column name in the dependent information object is not modified. Filters on a deleted column are deleted. Computed columns and filter expressions that contain the column name are not deleted.
To override the default behavior, choose Window→Preferences→Actuate BIRT Project→Information Objects and make the appropriate selections. Figure 2-3 shows the default settings for column and parameter renaming and deletion.
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Figure 2-3
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