QB Issue Resolution:

Invoices are AR, and Receive Payments satisfies (reduces) AR balances.

You don’t use Receive Payment unless you have open charges on invoices. If you accept payments with no charges, you are creating AR credits = Negative customer balance.

Resolution for Issue 'Why do sales in the transactions section show up as -£amount?' available: Yes (Solved).
Source: Intuit Community forum.

Why do sales in the transactions section show up as -£amount?: 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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