This is because the payment method is associated with the transaction total line and not the detail lines that are included in item detail reports.
Resolution for 'Adding column to report issue: 'Adding column to report' available: Yes.
The Adding column to report 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 Adding column to report issue yourself by looking for a resolution described in the article. If it is a complex Adding column to report issue or you are unable to solve the issue, you may contact us by clicking here or by using other Adding column to report support options.
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