SQL Server Database Error

I am trying to recreate a view a vendor built in a test db.  Here is the create view script:

CREATE VIEW [faster].[VW_DPN_DEOWNERSHIP] WITH
   SCHEMABINDING
AS
   SELECT EXUID,
          EHKey,
          EXOpID,
          EXEHUID,
          EXDeptTo EXDeptFrom,
          EHDateCreated,
          EXEffectiveDate BeginDate,
          NULL EndDate
     FROM faster.EXTransfer, faster.EHeader
    WHERE     EXEHUID = EHUID
          AND EXDeptFrom = '---NONE---'
          AND EXEHUID NOT IN (SELECT DISTINCT EXEHUID
                                FROM faster.EXTransfer
                               WHERE EXDeptFrom <> '---NONE---')
   --Get Transfers in date order for Eq with more than one transfer that is not the base record transfer
   UNION ALL
   SELECT EX1.EXUID,
          EHeader.EHKey,
          EX1.EXOpID,
          EX1.EXEHUID,
          EX1.EXDeptTo,
          EHeader.EHDateCreated FirstDate,
          EX1.EXEffectiveDate BeginDate,
          EX2.EXEffectiveDate EndDate
     FROM (SELECT DISTINCT EXUID,
                           EXOpID,
                           EXEHUID,
                           EXDeptFrom,
                           EXDeptTo,
                           EXEffectiveDate
             FROM faster.EXTRANSFER, faster.EHeader
            WHERE EXDeptFrom <> '---NONE---') EX1
          JOIN (SELECT DISTINCT EXUID,
                                EXOpID,
                                EXEHUID,
                                EXDeptFrom,
                                EXDeptTo,
                                EXEffectiveDate
                  FROM faster.EXTRANSFER
                 WHERE EXDeptFrom <> '---NONE---') EX2
             ON     EX2.EXDeptFrom = EX1.EXDeptTo
                AND EX1.EXEHUID = EX2.EXEHUID
                AND EX2.EXEffectiveDate >= EX1.EXEffectiveDate
                AND EX2.EXDeptFrom <> '---NONE---'
          JOIN faster.EHeader
             ON EX1.EXEHUID = EHUID
   UNION ALL
   --Gets all transfers that are to the current DPN (EndDate is today
   SELECT EXUID,
          EHKey,
          EXOpID,
          EXEHUID,
          EXDeptTo,
          EHDateCreated,
          EXEffectiveDate BeginDate,
          NULL EndDate
     FROM faster.EXTransfer, faster.EHEader
    WHERE EXEHUID = EHUID --is the current department transfer record
          AND EXDeptTo = EHDept
          AND EXEffectiveDate =
                 (SELECT MAX (ex.EXEffectiveDate)
                    FROM faster.EXTransfer ex
                   WHERE ex.EXDeptTo = EHDept AND ex.EXEHUID = EHUID)
GO


Here is the error I get when I try to create it:

SQL Server Database Error: The column prefix 'EHeader' does not match with a table name or alias name used in the query.

I added it to the FROM portion and that didn't fix it, is there something else I am missing?