I would say NO for HACCP, yes for HARPC.
HACCP:
The Control Points on a HACCP plan are meant for operational processes. The letter of guarantee (LoG) is more a pre-requisite for your suppliers, and not a control itself. With that said, you should reference the use of LoG in your HACCP plan when you are doing your risk analysis and use it as justification to determine the hazard for that step (I assume raw materials receiving, or chemical receiving). If you determine the LoG is sufficient to lower the risk to an acceptable level, then you can determine there is no operational control needed (Not in the HACCP plan), but if it is not sufficient, then you need to implement an actual Control Point (something that is actually done at receiving), such as temperature check, QA inspection, microbiological tests.. etc.
HARPC:
Different than HACCP, HARPC includes risks and controls not only on operational processes but also on other activities such as supplier control. In this case, a LoG could be a control point, or more like part of a control point program (Supplier approval program). Just be aware that under FSMA, you are responsible to verify your supplier are in compliance with the FSMA regulations, and in the case of food suppliers (ingredients), FDA won’t accept just a LoG by itself as proof that your suppliers are in compliance.
In this case (food suppliers) the LoG is part of the supplier approval program, along with other documents such as supplier risk assessment, 3rd party audits, internal audits, etc), Based on that, the supplier gets approved or rejected. Then, the actual control point is that the supplier is approved. (e.g. in the company system, or in the list of approval supplier).
Edited by Antores, 22 January 2019 - 02:02 PM.