RISE: Who needs to sign the partnership agreement?

The partnership agreements are not mandatory but are strongly recommended - see Guide for Applicants (pp. 10 -11):
“Similarly to the role of beneficiaries, partner organisations contribute directly to the implementation of the research project by supervising, sending/hosting and training staff members. They provide secondment opportunities as well as ensure transfer of knowledge. Partner organisations are located in a TC and Marie Skłodowska-Curie Actions, are not signatories to the Grant Agreement. Therefore they do not directly claim costs of the project from the REA. Financial aspects between partner organisations and beneficiaries are dealt within the partnership preferably by means of a Partnership agreement.”
The Work Program specifies (p 39): "Consortia involving partner organisations are encouraged to sign a partnership agreement to regulate the relationship between participants. These partnership agreements shall be in compliance with the obligations laid down in the Agreement."
Consortia involving partner organisations are encouraged to sign a partnership agreement to regulate the relationship between participants. These partnership agreements shall be in compliance with the obligations laid down in the Agreement. It should be signed by the authorized representatives, as it concerns the financial aspects, otherwise such a partnership would not have a legal power.