What is the tolerance threshold under the EU-Mexico?

The general tolerance is 10% of the ex-works value of the finished product.

EU-Mexico - HS 11

EU-Mexico Global Agreement (FTA part)

4 RegelnToleranz: 10%2000

1101-1105Products of the milling industry; malt; starches; inulin; wheat gluten

Manufacture in which all the cereals, edible vegetables, roots and tubers of heading 0714 or fruit used must be wholly obtained.