I encountered this situation twice this week with two different clients I tutor, so I thought I’d do a short video to highlight 
I’m sure many of you will already be very familiar with this, but for those that aren’t, it may save some heartache further down the line. 
Description:
The issue arises when the line item prices are linked to the product list using formulas, causing historical orders to update whenever product prices change.
To overcome this, the tutorial demonstrates a simple yet powerful solution using record rules.
Using Record Rules for Line Items
