When you are registering bank transactions / general journals, you want to apply your vendor ledger entries. Now with the fields 'Applies-Doc No' you can only automatic search after own document number but not after external document numbers. It should be good to extend this.
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Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.

Best regards,
Business Central Team