Is it compulsory for the ongoing 4th Call to have at least 1 activity per WP that last for all the project duration (33 months)?

The Call 04 invites 2 types of projects: test projects and transfer projects.
Test projects will last 33 months, while transfer projects will last 27 months.
For both types of project, the activities are not intended to last for the entire duration of the project.
You will find full details of these activities in the Programme Manual, section I. Building my project and submitted my application -Chapter B Designing the project activities – ii. Composition of a project – f. Mandatory activities to be integrated in each proposal.