Hello Hernan,
I checked into my 2012 R3 Contoso box and here is process i would suggest to follow;
1. User Excel Add to import Batch Master, Go to Excel > Dynamics AX > Add Data > Add Table

2. Select Invent Batch Table from the list and click ok

3. From the fields list select the requisite field and add column e.g. below i added Manufacturing Date

Close the fields selection
4. Update the data in excel

5. Click on Action Pane > Publish > Publish All or Publish Selected (as per requirement)
Batch is created

Now you can use the use the same Batch ID in your Movement Journal.
Hope this answers your query. As for the DIXF concern, there is no out of box data entity available for Item Batch.
Let me know if you have any more query.
Regards,
Ashish