This type of row connection is the most commonly used connection. It passes on data flows from one component to the other, iterating on each row and reading input data according to the component properties setting (schema).
Data transferred through main rows are characterized by a schema definition which describes the data structure in the input file.
You cannot connect two Input components together using a Row > Main connection. Only one incoming Row connection is possible per component. You will not be able to link twice the same target component using a main Row connection. The second Row connection will be called Lookup.
To connect two components using a Main connection, right-click the input component and select Row > Main on the connection list.
Alternatively, you can click the component to highlight it, then right-click it or click the O icon that appears on side of it and drag the cursor towards the destination component. This will automatically create a Row > Main type of connection.
For information on using multiple Row connections, see Multiple Input/Output.