Where do the amounts come from on the 6-1-7-21 Over/Under Billing report?

Budget - The amount of the 6-2 Budget plus all 6-4-1 Change Orders on the Budget and Sub Change Details tab where:

• A Status of 1-Approved appears in the header.
• A date appears in the Approved box.
  Note: If the lines on the Budget and Sub Change Details tab are for a change to a subcontract, the Status column on the row must also be 1-Approved.
• Note: Budget is actual costs when costs exceed the budget.
• % - The percentage determined by dividing the Costs value by the Budget value.

Contract - The value found in the Contract box of the 3-5 Job window plus all 6-4-1 Change Orders on the Prime Change Details tab where:

• A Status of 1-Approved in the header.
• A date typed in the Approved box.
• A value in the Approved column.

Earned - The percentage in the % column multiplied by the amount in the Contract column.

Billed - The total amount of all 3-2 Receivable Invoices/Credits assigned an Invoice Type of 1-Contract, minus any sales tax amounts.

Over/Under - The amount in the Billed column subtracted from the Earned column.

Where does the contract amount on the 6-1-7 Over/Under Billings report come from?
Where do the numbers in the 6-1-7 31 Over/Under Billing report extended version come from