SLA rules for freight lines for invoices matched to POs with Destination Type Inventory

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Hi. We need to write SLA rule for freight lines that are allocated to item lines such that always a constant value is derived for natural account segment. Further, we need to add a condition that destination type for the PO to which the invoice is matched to should be 'Inventory'. However, since we do not have PO information on Freight lines, we are unable to add this check. Hence, please suggest that how can we establish this condition while writing the SLA rule.

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