Business validation error: The action could not be completed because another user was creating, editing or deleting a transaction with inventory products at exactly the same time.
Overview:
We get this error when another user works on the same transaction from any other computer.
Error Message:

Resolution :
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Make sure that no one is currently working in your QuickBooks. Wait for some time and then attempt the task again.
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If the issue persists, close the QuickBooks company file on all the other machines and try to post the order.
Feel free to initiate a Support Chat if the issue persists.