I am currently pursuing LEED certification for a building and have been tracking various items that have been purchased during the last 6 months. I am under the impression that performance periods generally must be a minimum of 3 months and 24 months max (excluding the two EA 1-yr PP). While entering the recent purchases on the form, I noticed that it states "purchasing periods may not exceed 3 months." Is this true and where is this stated in the reference guide? I hope that this is some kind of mistake or typo. Help!