Wrongly citing a method of measuring an essential product parameter may constitute insufficient disclosure (T 1250/01, applied in T 484/05 (unusual parameter)). In T 1250/01 the consequence of an error in the description was that no method for measuring an essential parameter was disclosed and, thus, the skilled person was not able to make any measurement of the relevant essential parameter (decision cited in T 206/08 (detergent compositions) but found inapplicable to the case in hand).