the affiliate is in charge of the internal process to define an endorsement. You can take a look at the other endorsements approved by other affiliates.
the person who should put the endorsement on the meta should be a primary contact or the official voter. It's possible to link to meta pages or external affiliates website with more details about the choice.
Please beware that it's very difficult to erase an endorsement because of the tight schedule. it's also a problem for candidate since the threshold is rigid. Please be very careful on your endorsement and try not to change them. it would be useful to contact the facilitators before doing so.
Or "Because of the great disruptions that it could cause, it would be improper for an affiliate to withdraw an endorsement. So please be deliberate when making endorsements."
Fine with me, what about "Please beware that because of the great disruptions that it could cause, it would be improper for an affiliate to withdraw an endorsement. So please be deliberate when making endorsements and contact the facilitators if you have any doubt about this scenario"