QB Issue Resolution:

on the expense transaction or purchase transaction about half way down on the left is Item detail, click that and a table opens so you can list products,qty and price for inventory being purchased

assumes you have inventory turned on in company settings, and you have created inventory items in the products and services list

Resolution for Issue 'Where and how do I receive items in quickbooks online?' available: Yes (Solved).
Source: Intuit Community forum.

Where and how do I receive items in quickbooks online?: 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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