I just did a mock recall on some produce and did not achieve 99.5-105% traceability (required by our 3rd party auditor). Our purchasing manager says we usually only get 78% yield on that ingredient due to 22% shrinkage/waste/etc, which I accounted for and ended up with 97% traced product. Of course this isn't the same every time and depends on that specific lot of produce. So, if I were to allow a 20-25% expected loss due to shrinkage, I could get 100% traced in this particular case.
A few issues with this:
1. Is this acceptable to an auditor?
2. If yes, how/where do I include a statement claiming our expected/allowable yield difference?
3. If no, how do I successfully get at least 99.5% with this problem?