That is correct. Costing is for inventory purposes. The average cost is there to be able to calculate the value of the cost in your inventory. NOT to be able to calculate the average cost that you normally take to produce said part. Because of that, average cost is updated when something comes into inventory. Either by a purchase receipt, or a job receipt to inventory. If said part does not go into inventory (like when you receive parts from one job to another, skipping inventory), there is no reason to update average cost, as it is not changing the value of what you have in inventory.
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Try setting the HT part as Non-Stock and see what happens.
If you are very confidant in your order entry, you can auto-firm jobs. 
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