2. Lack of unity during search 

In many and probably most instances, lack of unity will have been noted at the search stage. In such cases, a search is conducted for the invention first mentioned in the claims and the applicant is invited to pay additional search fees with Form PCT/ISA/206. See B‑VII, 2.

See also ISPE Guidelines 10.60 for the process at the international search stage and ISPE Guidelines 10.83 for the process at the supplementary international search stage.

EPC Guidelines F‑V, 4 applies mutatis mutandis, with the exception of those aspects already covered above.