The Estimated Material Cost in the Shop Order is being reset to zero after backlashing.

Parent  - MP A (Manufactured), Component - PP A (Purchased)

Both Parts are Lot Tracking

Inventory Valuation Method - Weighted Average

Inventory Part Cost Level - Cost Per Lot Batch

Steps

1. Create a product structure for MP A with a quantity per assembly (QPA) of 1 pc of PP A.

2. Receive inventory for PP A into cost bucket 110 at $2 per unit, quantity 10. (After issuing to the Shop Order, on-hand will become zero.)

3. Create a Shop Order for MP A with a lot size of 10. Disable auto-close for this Shop Order.

4. Perform Manual Material Issue for PP A to the Shop Order.

5. Create the Lot/Batch.

6. Receive the Shop Order and review the Shop Order Cost.

Repeat the Scenario Using Backflush

1. Recreate the same setup.

2. Instead of manually issuing materials, enable Backflush for PP A.

3. Receive the Shop Order and review the Shop Order Cost.

Estimated Accumulated Cost changed to Zero.

Is there a specific reason for this behavior?