From the FCRA: [the 2004 version of the FCRA posted by the FTC including the FACT Act revisions]
§ 623. Responsibilities of furnishers of information to consumer reporting agencies [15 U.S.C. § 1681s-2]
(2) Duty to correct and update information. A person who
(A) regularly and in the ordinary course of business furnishes information to one or more consumer reporting agencies about the person's transactions or experiences with any consumer; and
(B) has furnished to a consumer reporting agency information that the person determines is not complete or accurate, shall promptly notify the consumer reporting agency of that determination and provide to the agency any corrections to that information, or any additional information, that is necessary to make the information provided by the person to the agency complete and accurate, and shall not thereafter furnish to the agency any of the information that remains not complete or accurate.
[Note: Consumers can NOT sue for section a) violations! Only regulators (who do NOTHING!) can enforce this section. Consumers must have claims under section b) (after dispute with a CRA) to be able to sue.]
(b) Duties of Furnishers of Information upon Notice of Dispute
(1) In general. After receiving notice pursuant to section 611(a)(2) [§ 1681i] of a dispute with regard to the completeness or accuracy of any information provided by a person to a consumer reporting agency, the person shall
(A) conduct an investigation with respect to the disputed information;
(B) review all relevant information provided by the consumer reporting agency pursuant to section 611(a)(2) [§ 1681i];
(C) report the results of the investigation to the consumer reporting agency;
(D) if the investigation finds that the information is incomplete or inaccurate, report those results to all other consumer reporting agencies to which the person furnished the information and that compile and maintain files on consumers on a nationwide basis; and
(E) if an item of information disputed by a consumer is found to be inaccurate or incomplete or cannot be verified after any reinvestigation under paragraph (1), for purposes of reporting to a consumer reporting agency only, as appropriate, based on the results of the reinvestigation promptly–
As you can see, the FCRA mandates COMPLETE reporting.