The 3.x InfoSource is not used in the new data flow. A new InfoSource type has been introduced instead. This is used to carry out complex transformations between two persistent objects in a multistep procedure.
General Practices with Migration
We recommend using automatic migration in most cases.
More information:Migrating Data Flows
For information about manually migrating 3.x InfoSources, seeMigrating Update Rules, 3.x InfoSources and Transfer Rules.