You can propagate datatype, precision, scale, and description to ports with implicit dependencies. When you click Options in the Propagate Ports dialog box, you can choose to parse conditions and expressions to identify the implicit dependencies of the propagated port. All ports with implicit dependencies are output or input/output ports.
When you include conditions the Designer updates the following dependencies:
Output ports used in the same lookup condition as the propagated port
Associated ports in dynamic Lookup transformations that are associated with the propagated port
Output ports used by a Custom transformation to define a port relationship with one or more input or input/output ports
Master ports used in the same join condition as the detail port
When you include expressions, the Designer updates the following dependencies:
Output ports containing an expression that uses the propagated port
The Designer does not propagate to implicit dependencies within the same transformation. You must propagate the changed attributes from another transformation. For example, when you change the datatype of a port that is used in a lookup condition and propagate that change from the Lookup transformation, the Designer does not propagate the change to the other port dependent on the condition in the same Lookup transformation.