Victoria,
A small confirmation, GP allow us to unapply the payable transactions if both "Apply From" and "Apply To" transactions are open status (partially applied). Am I correct?
If the "Apply From" transactions is partially applied, then we need to follow the procedure mentioned from your blog post.
If the "Apply To" transaction is partially applied, for this case we need to unapply the applied amount. So, we can void the "Apply From" transaction and re apply it to new documents(I have mentioned by previous post). Please confirm.
Your suggestion is highly appreciated.