Thank you both.
Chapter 7 in the Redbook was very helpful, I also search GAO for "requirement of specificity" which led me to my next question.
How broad can you classify supplies in any sort of order, whether it be a PO, BPA Call, Contract etc.. to pass the test?
For example the a BPA completed by my predecessor was established for "Medical Supplies, OTC and Prescription Medications" in accordance with the same circumstances as the BPA in my initial post.
The first BPA Call was for $16k, with a PoP for an entire year. The description of supplies block states " Misc wellness supplies including, but not limited to, student prescriptions, OTC medications, and other supplies as needed ".
Personnel as I stated above would place orders with the vendor against this award and the vendor would issue a summary invoice at the end of month and the PA would pay that invoice.