[SalesForce] Multi-Step Approval Process

Selecting Next Automated Approver Determined by.. allows Salesforce to determine who will be the approver of this step, based on the manager (or a custom field) of the current user.

As you can see half way down the documentation here.

For example, you may want approval requests automatically routed to a user's manager as specified in the Manager standard user hierarchy field. Or, you may want approval requests automatically routed to an associate specified in a custom Account Manager user field.

Using the custom field option you can select different approving users to the current users manager, which can be useful if a person may have different superiors for different tasks.

If you don't select this box you will specify a user to approve the step from within the step. If you have selected to automatically assign the approval, you will have the option in the red box here against each step, if you did NOT select Manager (or a custom field) in the drop down above, you won't be able to do this.

but (again, in the documents) if you have one step in a process that breaks out of the "automatic rule" assignment, none of the steps can use this (as, as you can imagine, the order of superiority might have been buckled by the manual assignment)

Approach actions can be performed at each steps.

In the approval step, click on Show Actions link to expand that.

So, you will define workflow field updates ("Approved By User A" or "Approved By User B") in each steps and in the final approval action update that as "Approved By Both".

Approach:

Define approval process as specific above

Results:

After first step approval, see that "Approval User A" value in the field which is getting updated from Step1 field update.

After 2nd step approval, see that "Approved by Both" value in the field which is getting updated from Step 2 field update.

Update based on comments

Approval action only triggers when both of Unanimous approvers will approve the record in a single step. Workaround could be you need to write batch process to update the record. So when you submit for approval you will initiate batch process in a specific interval and update the record upon unlocking and re-lock again and finally after completion of approval you will terminate the job.