How to identify if a PO is from planned orders or back-to-back order?

Summary:

How to identify if a PO is from planned orders or back-to-back order?

Content (required):

We would like to know how we can identify a PO if its from planned orders or back-to-back orders. Is there any field in UI or back-end that we can check to differentiate the two. In our initial chekcing, interface_source_code in back-end has SCO value for both orders, so this will not help as well.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):