QB Issue Resolution:

Open Vendor Center, single-click that payee name, use Ctl Q = Quick Report. Here are their activities.

Open Chart of Accounts, single-click that Loan, use Ctl Q = Quick Report. Here is the Activities in this account.

Run balance sheet, and double-click the Loan balance, to Drill Into its activities. Here are transactions that are affecting it.

Please see my attachment.

Resolution for Issue 'Need to look up how loan payment was posted, how do I see previous entries, it could be a journal entry, or a vendor.' available: Yes (Solved).
Source: Intuit Community forum.

Need to look up how loan payment was posted, how do I see previous entries, it could be a journal entry, or a vendor.: 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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