There are several reasons why the EPO as ISA may refuse or will not be able to perform a (full) international search. Such refusal may relate to e.g.
the subject-matter of the application (see point 253254
), non-compliance with requirements regarding the description, claims or drawings of the application (see point 256257
), missing sequence listings (see point 260261
) or lack of unity of invention (see points 261262