Account Receivables - Automatic Maintenance Process - Steps to execute

Hi,
    Can somebody provide me the steps to replicate the AR automatic maintenance process along with screenshots(helpful for  my understanding). I tried here to execute and iam getting "0 Credit/Debit Items has process for matching" and "No worksheet created". Iam just wondering if iam missing something.

Reference:
Request a process to automatically match debits to credits.
 Main Menu>Accounts Receivable>Receivables Maintenance>Automatic Maintenance>Request Automatic Maintenance

Steps i tested;
1. create bills to ready
2. then run the below processes in billing;
            finalize and print
            currency conversion
            pre-load process
            load invoices to AR
            create accounting entries
3. Checked for external items --> group entry