What is the tolerance threshold under the Ceuta & Melilla?

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

Ceuta & Melilla - HS 12

EU Autonomous Preferences for Ceuta and Melilla

1 RegelnToleranz: 10%

1200-1299Oil seeds and oleaginous fruits; miscellaneous grains, seeds and fruit; industrial or medicinal plants; straw and fodder

Manufacture from materials of any heading, except that of the good.