QB Issue Resolution:

This means that you have a partial entry in the check register. That entry needs to be completed or abandoned (by clicking the Restore button the register). I believe if you double click on the triangle it will take you to the entry in the register (maybe you have to click “Show Matched”).

Resolution for Issue 'How can I get rid of the yellow triangle in the downloaded transactions window? It says to record the last transaction and I have but it won’t go away and it prevents any further work.' available: Yes (Solved).
Source: Intuit Community forum.

How can I get rid of the yellow triangle in the downloaded transactions window? It says to record the last transaction and I have but it won’t go away and it prevents any further work.: 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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