I took some time to prepare step by step document for Vendor Direct Debit scenario, how to achieve using EBS and Search String functionality in SAP. I am sure this post is informative and help you achieve it quickly.
There may be blogs and posts relevant to this topic but you might not find complete setup. This blog will help you how to do the configuration of EBS and Search String specific to vendor direct debit scenario, which includes screenshots of step by step configuration and sample MT940 statement with real time example with detailed explanation.
Also you can achieve this in two different ways and it’s explained with accounting documents how to achieve through EBS and Search String function.
Please comment, if you have any question or clarifications and additionally you can use below link to post your Q&A.
Conclusion: Finally you would be able to complete vendor direct debit scenario. You would be creating an open item with Vendor account and post the payment to main bank account. Refer to below accounting documents shown the screenshots at the end.