Tables can be entered in and extracted from the function module / BAPI. Therefore, there are two types of behavior for tables: input type and output type.

BAPI-Tables

The following options are possible:

Pipeline
This means that the table is imported from (or exported to) a pipeline within the data flow task. To import tables via a pipeline, use the Edit link to open up a dialog to map the pipeline elements.

Static
This means that the table values are static and independent of all pipeline types. Use the Edit link to open a dialog to define static table values. The type Static is only available for the input type.

Skip
This simply means that the table is ignored.