Is there any way to capture event while returning back to Requisition screen from Punchout site?

Summary:

Is there any way to capture event while returning back to Requisition screen from Punchout site? So that we can change the requisition source type to Internal from External.

Content (required):

Is there any way to capture event while returning back to Requisition screen from Punchout site? So that we can change the requisition source type to Internal from External.

Version (include the version you are using, if applicable): 23B

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