Identify Back Oder Sales Orders in SO_SalesOrderHistoryHeader table

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Hello,

We are trying to run some basic metrics surrounding Back Ordered Sales Orders, i.e. "How many Sales Orders had back ordered items last month". Problem is, I can't seem to find any data fields in the SO_SalesOrderHistoryHeader table that would identify that a Sales Order had back ordered items. I could try to use the "QuantityBackordered" field on the SO_SalesOrderHistoryDetail table, but it appears that when the back ordered item gets shipped, it changes this field to 0, so it doesn't help me if I'm trying to report historically.

Do you have any suggestions on how we can track this? Is there any field available on the AR_InvoiceHistoryHeader table that would identify the Invoice as being related to a Back Ordered item?

Thanks,

Colin