QB Issue Resolution:

Everything is inventory if it is resold. It is not cost of goods sold for any inventory purchase. It is only COGS when sold. Anything that can be counted has to be counted at least once per year and chances are they have a number of tanks in stock on 12/31

Resolution for Issue 'CoGs vs Inventory' available: Yes (Solved).
Source: Intuit Community forum.

CoGs vs Inventory: 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 COGS
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Error Recovery for COGS [Canada]
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