When you update a source definition, the Designer propagates the changes to all mappings using that source. Some changes to source definitions can invalidate mappings.
The following table describes how you can impact mappings when you edit source definitions:
Mappings are not invalidated.
Change a column datatype.
Mappings may be invalidated. If the column is connected to an input port that uses a datatype incompatible with the new one, the mapping is invalidated.
Mapping may be invalidated. If you change the column name for a column you just added, the mapping remains valid. If you change the column name for an existing column, the mapping is invalidated.
Mappings can be invalidated if the mapping uses values from the deleted column.
When you add a new column to a source in the Source Analyzer, all mappings using the source definition remain valid. However, when you add a new column and change some of its properties, the Designer invalidates mappings using the source definition.
You can change the following properties for a newly added source column without invalidating a mapping:
If the changes invalidate the mapping, you must open and edit the mapping. Then click Repository > Save to save the changes to the repository. If the invalidated mapping is used in a session, you must validate the session.