PO SLA - What Source can I use for PO Line Amount?

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I am writing a condition in a PO SLA accounting rule that will assign an asset account if the unit price > $25,000 OR line amount > $50,000.  I see a source for unit price as 'LINE PRICE' but I do not see a source for line amount.

Is there a source for PO line amount?  I tried XCC_AMOUNT but this does not work.

Thank you