Invoice/Bill status getting changed when a Credit Note is created

Summary:

When we create a Credit Note against an original Invoice/Bill, the original record's status is being changed automatically:

• Bill: BILL_APPROVAL_APPROVED → BILL_APPROVAL_NOT_APPROVED
• Invoice: APPROVAL_APPROVED → APPROVAL_APPROVED_REJECTED

we're using the Credit Note purely to nullify or partial nullify the original Invoice, and expect the original's approval status to stay untouched.

Is this expected OTM system behavior or is this a bug?

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