Why is a "blind" purchase order used as a receiving report document?
To understand the reason for the blind purchase order, you have to first understand the control need and human nature.
Let's talk first about human nature. Have you ever tried to proofread your own paper? It is harder than proofreading your roommate's paper. Why? Because when you read your own, you have an expectation about what the sentence SHOULD say. When it is another's paper, you have no expectation about what it should say (or if you do, your ability to catch all the edits goes down). So, as a practice matter, not having the details of the ...
Your tutorial is 362 words and explains the two main reasons for leaving off the quantities on purchase orders ("blind purchase orders").