what is the most efficient method for posting a/p and filing paid a/p?

SMB solution:
In the days of multi-part NCR paper forms - before ERP systems - we used to file copies of checks with the paid Invoice. But certainly not in today's paperless (ha!) digital environment.

Two options:
1) Paper files: staple the voucher of a three-part laser check to the A/P invoice and file by Vendor
2) Digital files: ERP reference on A/P invoice and scan to vendor file.

One other comment....It amazes me to see customer/vendor checks where the PAYER's check stub doesn't have that company name on it! Stub should either be pre-printed, or the Payer's ERP should add the Payer's information to the laser check stub as a text field.