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 '3K credit issue: 'How To Manage Overpayment' available: Yes.

The 3K credit 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 3K credit issue yourself by looking for a resolution described in the article. If it is a complex 3K credit issue or you are unable to solve the issue, you may contact us by clicking here or by using other 3K credit support options.

For more information about resolving issues related to 3K credit in Quickbooks/QBO or to get support for the issue 'How To Manage Overpayment', click the link below: