QB Issue Resolution:

You may pay all the bills as usual and use the Set Discount option to enter a discount for 15K for that bill’s remaining balance.

The discount amount should also be linked to an Income Account (e.g. Discount Income)

Resolution for Issue 'How to record a negotiated vendor payment?' available: Yes (Solved).
Source: Intuit Community forum.

How to record a negotiated vendor payment?: 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 Payment
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Error Recovery for Payment [Canada]
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