b) Reasons for decision deficient 

R. 111(2) EPC gives parties to EPO proceedings a fundamental procedural right to be provided with the reasons for a decision (J 18/16). Lack of compliance with R. 111(2) EPC is a fundamental deficiency, which, according to Art. 11 RPBA 2007, should lead to an immediate remittal of the case to the department of first instance, unless special reasons present themselves for doing otherwise (T 2275/15; see also T 1553/07, T 546/10 (decision based on the state of the file), T 2393/11, T 2245/12, T 395/13, T 2424/13, T 591/17, T 1922/17). For more details, see chapter III.K.3. "Form of decisions".