Fixed Asset Controls

I am afraid our fixed assets are out of compliance with standard procedure.  ​I was wondering how other credit unions handle their IT equipment when it comes to tagging it and accounting for it in fixed assets?  Does your IT staff tag it and log it into fixed assets when it comes in because they know what it is or do you train someone on your Accounting staff to recognize the specialized equipment?  Do you tag it only once per year or as it comes in? 

Also, do you ever have someone get a purchase order approved for a vendor and then purchase the item from a different vendor?  Is that against your policy?

Thank you so much for any insight you can provide!