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Any OCLC cataloging member using full authorization may lock a bibliographic record, add or edit the fields as shown below, and use the Replace command to change the master WorldCat record. The record reflects the library symbol in ‡d of the 040. If a user modifies a record in several ways that generate a credit, the user receives only one credit for the replace transaction. This table verifies when the action also earns a database enrichment credit (ONT2565).

Tag Description Credit Notes
006 Fixed Length Data Elements—Additional Material Characteristics NO May add additional field but not edit existing field
007 Physical Description Fixed Field NO May add additional field but not edit existing field
020 ISBN NO May add additional field but not edit existing field
022 ISSN NO May add additional field but not edit existing field
024 Other Standard Identifier YES May add additional field, if not already present with the same code in ‡2, but  not edit existing field
027 Standard Technical Report Number NO May add additional field but not edit existing field
028 Publisher Number NO May add additional field but not edit existing field
030 CODEN Designation NO May add additional field but not edit existing field
041 Language Code NO May add additional field but not edit existing field
042 Authentication Code NO Non-repeatable; may edit existing 042 field, or add 042, if not present.
043 Geographic Code NO Non-repeatable; may add field, but not edit existing field
050 Library of Congress Class # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
052 Geographic Classification NO May add additional field but not edit existing field
055 Call #/Class # Assigned in Canada YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
060 National Library of Medicine Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
070 National Agricultural Library Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
072 Subject Category Code YES May add additional field but not edit existing field
080 Universal Decimal Classification # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
082 Dewey Decimal Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type  in record
084 Other Classification Number YES May add additional field, if not present with the same code in ‡2, but not edit existing field
086 Government Document Class # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
088 Report Number NO May add additional field but not edit existing field
090 Locally Assigned LC-type Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type  in record
092 Locally Assigned Dewey Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
096 Locally Assigned NLM-type Call # YES Must be authorized for class scheme in which adding a call number; cannot add or modify call number of type in record
300 Physical Description NO May add additional field but not edit existing field
505 Formatted Contents Note YES May edit existing 505 or add 505, if not present
506 Restrictions on Access Note YES May edit existing 506 or add 506, if not present
520 Summary, Etc. Note YES May edit existing 520 or add 520, if not present
526 Study Program Information Note YES May edit existing 526 or add 526, if not present
530 Additional Physical Form Available Note YES May edit existing 530 or add 530, if not present
538 System Details Note NO May add additional field but not edit existing field
583 Action Note YES May edit existing 583 or add 583, if not present
600
610
611
630
650
651
Subject Added Entry-Personal Name
Subject Added Entry-Corporate Name
Subject Added Entry-Meeting Name
Subject Added Entry-Uniform Title
Subject Added Entry-Topical Term
Subject Added Entry-Geographic Name
YES May add new, but cannot modify subject heading of same type in record; must be authorized for subject heading scheme in which adding a subject heading
655 Index Term-Genre/Form YES May add additional field, with the same code in ‡2, but  not edit existing field
656 Index Term-Occupation YES May add additional field, with the same code in ‡2, but not edit existing field
657 Index Term-Function YES May add additional field, with the same code in ‡2, but not edit existing field
856 Electronic Location and Access YES May edit existing 856 or add 856, if not present

Last revised: 21 October 2004