IS IT COMPLIANT TO POST AN OPEN MARKET CLIN ON A BPA CALL AGAINST A GSA SCHEDULE?
You can post an open market CLIN as long as it is BELOW the micro-purchase threshold. The reason being that a true open market CLIN will need to be competed.
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As a side note, the KO can always try to have the item added to the GSA schedule, I am assuming that you have checked (RFQ'd) all the schedules to validate that the item was not there.