Assistance with Pretransformation defaulting Rules for mapping OM to AR Credit Memo Transaction type

Summary:

Hello,

Can we use the pretransformation defaulting rules to map the OM header transaction type with the AR transaction type for invoices of type credit memo?

I haven't been able to identify the correct attribute to do so. Is the attribute "Total amount of the sales order" available to use in a condition such as: if the total amount of the sales order is negative, then use the AR credit memo transaction type?

Please advise.

Regards,
Salim

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