Data Transformation Engine Integration Flow Designer Reference Guide

Chapter 9 - Links External Links
Integration Flow Designer Reference Guide
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A database link is drawn between two map components when the
Select
statement defined in the database source of one of the maps references the table
associated with the database target of another map. You can view the links
explicitly if both map components are expanded, as shown below.
A messaging link is drawn between two map components when the messaging
source of one of the maps references the messaging target of another map.
A file link is created between two map components when the file named in the
source of one of the maps references the same file in the target of another map.
Changing the default sources or targets defined within a source map or compiled
map file using the Map Designer, or changing the source or target overrides by
using the IFD has a direct effect on the external links that are drawn.
The IFD prevents you from deleting external links that it has automatically
derived. You must either delete one of the components or change the source or
target settings to remove an external link.