anchor.diff:  Product Or Service Code,PSC_Code
   PSC Description,PSC_Description
   Product or Service Description,PSC_Description
  -Contracting Agency ID,Contracting_Agency_ID
  +Contracting.Agency.ID,Contracting_Agency_ID
   Contracting Department ID,Contracting_Department_ID
   Funding Agency ID,Funding_Agency_ID
   Place of Performance City,Place_of_Performance_City
  
positive.code: PIID,PIID
  Referenced IDV PIID,Referenced_IDV_PIID
  Vendor DUNS,Vendor_DUNS
  Action Obligation,Action_Obligation
  Contracting Department Name,Contracting_Department_Name
  Contracting Agency Name,Contracting_Agency_Name
  Funding Department ID,Funding_Department_ID
  
negative.code: Award or IDV Type,contractactiontype
  Multiple or Single Award IDV,multipleorsingleawardidc
  Type of Contract,Pricing.Mechanism.Code
  Pricing.Mechanism.Code,Pricing_Mechanism_Code
  Action Obligation,Action.Obligation
  contractingofficeagencyid,Contracting.Agency.ID
  Index,Index
  