Part 43 - Contract Modifications 43.000 Scope of part. 43.101 Definitions. 43.102 Policy. 43.103 Types of contract modifications. 43.104 Notification of contract changes. 43.105 Availability of funds. 43.106 [Reserved] 43.107 Contract clause. 43.201 General. 43.202 Authority to issue change orders. 43.203 Change order accounting procedures. 43.204 Administration. 43.205 Contract clauses. 43.301 Use of forms.