BRCGS Food Safety - 5.4. Product authenticity, claims and chain of custody

Background: 

The last audit that we had with BRC we received a minor for 5.4.6. which Stated: "The process flow for the production of products where claims are made shall be documented and potential areas for contamination or loss of identity identified. Appropriate controls shall be established to ensure the integrity of the product claims". 

The auditor wrote: “There is no documentation to prove that the soy squares are in fact Hexane-Free”. 

We have a Certificate ID No. with a Expiration Date that said the Product is Hexane Free Soy Protein Concentrate. 

I am new at this company.  if anyone has any background with this it would be glad if you able to pass this one. 

Thanks, 

Quality Control Manager 

Hi,
Have you carried out a scheduled mass balance to proove that the product with the claim has actually got Hexane-Free soya squares? However, BRC doesn't require you to carry out MB on every claim. Do you use non-Hexane-Free soya as well?