After a change order is created, is there a table where previous versions of taxes are stored?

We are trying to create a report for when a change order is created in the Purchase Order (PO) to change the tax and it gets approved. We want to see what the tax is after the change is approved and what the previous tax was before the change order was created.

We searched in the ZX_LINES table but were only able to see the updated tax after the approval of the change. We need to find the tax value that was present before the change order was created. Is there any table where we can find this information, similar to PO archive tables where we can see different versions of PO headers, lines, etc.?