There must be a causal relationship between the arguments in the statement of grounds of appeal and the reasons given in the decision under appeal (T 2012/16). The absence of any correlation of the ground of appeal to the decision under appeal is detrimental to the admissibility of the appeal (T 340/09).

Under Art. 108 EPC a statement setting out the grounds of appeal shall be filed within four months after the date of notification of the decision in accordance with the Implementing Regulations (see R. 99 EPC).