I think it is very useful if we can copy a batch and be able to change the reference and set it as a default for the new batch. Especially if the batch is a long one. In the old system when we copy a batch we are able to copy and paste the reference to the whole new batch, with this system we have to change one by one when we change the numbers. This is very time consuming. If we can have this feature every long journal entries would be much faster.
I doubt that will be a possibility to do but you can do a global change to that field in your open batch. I am attaching a file with the image but choose the "batch" "global change" in the tool bar. Select the journal reference field and enter the information you wish to put in that field. This will overwrite whatever is in that field currently with your new information. Make sure to mark the overwrite button as indicated.