STEPS:
1. Under Setup > Import/Export > Export expand the Accounts Payable menu to locate EDI 820 Payment Order / Remittance Advice Send. Double click to open.
2. Enter the following in the appropriate fields:
3. P21 Vendor ID
4. Bank Number
5. Check Number from P21
6. Change Export Source to EDI Export
7. Enter Export Directory as \\P21TPCX\P21ExportDirectory
8. Click Save or Ctrl S to generate the export.