QB Issue Resolution:

pay the bill 3K on one payment

on the second payment of 3K, select accounts payable as the expense for the payment, select the vendor name in the pay to, that will set a 3K credit for that vendor

Resolution for Issue 'How To Manage Overpayment' available: Yes (Solved).
Source: Intuit Community forum.

How To Manage Overpayment: 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.

Support for 3K credit
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Error Recovery for 3K credit [Canada]
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