Hello Martin
Strategy 82 is not a make-to-order strategy, but an assembly-to-order (ATO) strategy. On this kind of strategy the production order is created automatically by the sales order and there is a direct link between the sales order and the production order. The following link provides more details about ATO:
Assemble-to-order - Assembly-to-order (LO-ASM) - SAP Library
If you want to create a MTO sales order, you should use strategy 20 instead of 82. See the following link for more details about strategy 20:
Make-to-Order Production (20) - Demand Management (PP-MP-DEM) - SAP Library
BR
Caetano