QB Issue Resolution:

You use Purchase Orders.

You enter the Item and the Qty = $ of this contract, and the Rate = $1.

Then you can Partially pay and detect overbilling.

This is the Fulfillment process of your order placed with the supplier of goods and services.

Resolution for Issue 'Is there a way, in either Contractor or Accountant versions, to enter a vendor contract amount and build a report that would show contract amount and amounts billed?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way, in either Contractor or Accountant versions, to enter a vendor contract amount and build a report that would show contract amount and amounts billed?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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