Ordered item from Sales Order line (with Item Identifier Type =Item Cross Reference) on Invoice line

The receivables flexfield 'Line Transaction Flexfield' for source ORDER ENTRY has the segment 9 as Customer Item Part - mapped to INTERFACE_LINE_ATTRIBUTE9.

This DFF (Customer Item Part) is populated on invoice line with the ordered item from the sales order line - as long as the Item Identifier Type = Customer Item Number.

However we use generic Item Cross reference with different types - instead of Customer Item Cross-Reference.

So if the sales order line is referencing Item Identifier Type as one of the generic Item Cross Reference Types and the ordered item is a value from there (along with internal item being the cross-referenced item master item), the ordered item is nowhere to be found on invoice line.