                             SECURITIES AND EXCHANGE COMMISSION
                                     450 Fifth Street, NW
                                     Washington, DC  20549

                        ------------------------------------------

                                          FORM 8-K
                                       CURRENT REPORT

                           Pursuant to Section 13 or 15(d) of the
                              Securities Exchange Act of 1934

                              For the Month of AugustOctober, 2003

                                                          ABN AMRO MUTUAL MORTGAGE CORPORATION,
                                                MULTI- CLASS MORTGAGE PASS-THROUGH CERTIFICATES,
                                     SERIES:  2003-4
                 (Exact name of the registrant as specified in charter)

                 Delaware                           333-101550-04         36-3886007
               (State or other         (Commission          (IRS Employer
               jurisdiction of         File Number)         Identification
               Incorporation)                               Number)


                                   75 NORTH FAIRWAY DRIVE
                                   VERNON HILLS, IL  60061

                         (Address of principal executive offices)

                    Registrant's telephone number, including area code:

                                      (847) 549-6500



ITEM 5.

     See Exhibit 99, the Distribution Report for the Month of AugustOctober, 2003,
attached hereto.

ITEM 7.

    FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION, AND EXHIBITS:


     EXHIBITS:

     99.    ABN AMRO Mutual Mortgage Corporation, Multi-Class Mortgage Pass-Through Certificates,Certificate
          SERIES:  2003-4, Monthly Distribution Report for AugustOctober 2003.

                                SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

Dated:    AugustOctober 2717, 2003

                                  WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
                                              (Registrant)

                                              By:   /s/
                                                    ------------------
                                                    RICHIEBACC MOOREALEXANDER
                                                    VICE PRESIDENT
Filing Compare · ABN AMRO MORT CORP MULTI CLASS MORT PASS THR CERT SER 2003-4
