The opinion given in the WO‑ISA is restricted to what has actually been searched; this should also be made clear in the WO‑ISA.
A full explanation of the conclusions reached should always be given for all searched claims, regardless of whether this conclusion is positive or negative. Normally only one independent claim in each category is treated in detail; for negative conclusions regarding further independent claims, as well as for dependent claims, comments may be shorter.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/b_xi_3_2_1.htm
Date retrieved: 17 May 2021