Auto Reconciliation in Cash Management module

In the Cash Management module, when performing manual reconciliation, we have two legs: the bank transaction and the system transaction.

For the bank transaction, it relates to the loading of MT940 files.
For the system transaction, it includes all the journal lines loaded through the import journals process. These journal lines are also available under the General Accounting module.

Since we are currently performing manual reconciliation, no reference is required under the System Transaction tab, as matching is done manually.

We now intend to perform auto reconciliation. For this, we will need to include the reference in the Reference column under the System Transaction tab. Please advise which column in the FBDI file should be populated when importing journals into Oracle Fusion.