Partially Filled Orders Doubt

manoj_trade
Please see the following scenario regarding partially filled order

1. Placed Nifty Buy 600 qty(8 lots) @14600

2. Partially filled, qty 150, so FilledQuantity = 150, and avgprice = average price of 150 qty and order still OPEN

3. Partially filled, qty 75, so FilledQuantity = 255 (150 + 75), and avgprice = average price of 225 qty and order still OPEN

Is the above assumption is true so that FilledQuantity would be in a cumulative level in the lifecycle of an Order. Please clarify.
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