If the submeters are not metering 100% of the load, the total energy will be lower than the sum of submeters.
If there are sub-sub meters, make sure you do not double count the load:
Example:

• Main Meter
  • Meter 1
    • Submeter 1.1
    • Submeter 1.2
  • Meter 2
    • Submeter 2.1
    • Submeter 2.2

If you define usage for Meter 1, Submeter 1.1 and Submeter 1.2, you will double count Meter 1 value.
In that case, you should not define usage for Meter 1.

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