QB Issue Resolution:

A PO is non posting, it is memo of what has been ordered

only a bill or item receipt, or other purchase will stock items

menu help>submit a suggestion for the PO site issue

Resolution for Issue 'Why doesn’t Qty on PO count not calculate on 2015 Enterprise Inventory Stock Status by Site Report?' available: Yes (Solved).
Source: Intuit Community forum.

Why doesn’t Qty on PO count not calculate on 2015 Enterprise Inventory Stock Status by Site Report?: 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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