In the past I've been putting the manufacturer lot# like "C-2014K" and other PLI numbers in the Manufacturer (MFTR) field, possible along with the actual manufacturer name if both appeared on the card. We've decided to start putting those numbers in the CATALOG field and then the actual manufacturer information can go where it belongs in the MFTR field. I'll be doing that with all new submissions from now on and I'll be working on cleaning up the older entries as I have time.