Business Central's standard approval workflows are designed for existing document types (like Sales Orders, Purchase Orders, or Journals). A "refund request" is not a native document type or concept in BC. Therefore, you cannot directly attach a standard approval workflow to a non-existent "refund request" document without custom development.
Business Central's standard workflows support approvals for documents before posting (like Sales Credit Memos). However, it lacks a dedicated "refund request" document type that would initiate an approval prior to creating the credit memo itself. Therefore, custom development is needed to build this pre-credit memo request and link it to the approval system.
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