[SalesForce] Unanimous Approval but not all approvers are required on every record

Unanimous Checkbox refers to each person or group within the approval process. Although the queue is made of many queue members, the queue counts as one approver, so whoever from the queue approves the record, is approving it on behalf of the entire queue. So as the way the approval process is set up, this is unanimous approval. In order to accomplish what you are trying to do each individual person would have to be named in the approval process. Then unanimous approval would require each individual person to approve before the pparoval goes through.

This is similar to using a queue as a record owner, although there can be multiple members of the queue, the queue still only counts as one entity, not a group made up by its members.

I hope that makes sense and helps.

We came across this situation recently and this is how we solved it..

1. Set the approvers in the process using "Related User" fields. If you leave it as "Manually selected" then you won't be able to submit to multiple approvers from Apex because the method setNextApproverIds() accepts only one ID (as you already know). By using "Related User" fields, you're eliminating the need to call setNextApproverIds() method.

2. In your code, populate the related users (approvers) on the object before you submit for approval. This implies that you define approver fields (lookups to User) on the object.

This way you have only one approval instance with multiple approvers and your unanimous setting in the process definition will work as expected and so do your final approval/rejection actions. Basically, you're defining everything in the approval process itself (which is how it should be) and in Apex you're just populating user fields and submitting for approval.

Now, one restriction you'll run into- you will need to populate all the approvers (related users) you defined in the approval process. For example, if you defined 3 approvers in the process then you must populate all 3 approvers. If a particular record needs only 1 approver as opposed to 3 defined in the process then it will fail. A workaround for that is to set the same approver for all three!