2.17 Can companies from the same group (mother company and subsidiaries based in other countries or in the same country) participate as partners or do they count as one partner, even if they have different VAT numbers? Published 2011/06/16

The principle is that only legal entities can participate. So if a branch office is registered as a separate legal entity in a country different than the head office, it can be considered as a partner coming from that country.
As a minimum requirement, a partnership shall represent 4 different eligible countries, of which at least one EU country and one Mediterranean Partner Country. However, situations whereby this minimum requirement is satisfied for example by a partnership including the head office from Italy and branch offices from Lebanon and Egypt, should be avoided. Therefore, a partnership should comprise other eligible partners alongside with the branch offices if they participate in the project.