QB Issue Resolution:

deleting the PO did not cause the errors you are seeing.  A PO does nothing to the accounting, it is non posting

You need to look for the another reason for the symptoms

Resolution for Issue 'how to clear a cash on hand asset that shows a – and also shows amout on inventory deleted. Those were errors want to clear that. thanks' available: Yes (Solved).
Source: Intuit Community forum.

how to clear a cash on hand asset that shows a – and also shows amout on inventory deleted. Those were errors want to clear that. thanks: 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 clear a cash
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