Partial Update Credit Memo

    Performs a partial update of an existing accounting credit memo using PATCH semantics.

    This endpoint allows selective modification of credit memo fields without requiring
    a complete credit memo replacement. You can update specific aspects of the credit memo while
    leaving other fields unchanged.

    **Updatable Fields:**
    - Credit memo metadata (dates, messages, descriptions, client, entity, currency)
    - Line items (amounts, accounts, descriptions, departments, products)
    - Reference numbers and contract associations
    - Exchange rates and currency information
    - Custom fields and additional metadata
    - Application status and tracking information