You can assign approvers to a vendor credit that requires one or more mandatory approvers. When you apply an approval policy to a vendor credit object, you can designate specific approvers (including the sequence of approvals) with /SetApprovers.json.
Note: To replace an approver assigned to a vendor credit or to change the sequence of approvals, remove all approvers assigned to the vendor credit (with /ClearApprovers.json) and then designate specific approvers (including the sequence of approvals) with /SetApprovers.json.
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