This standard establishes the file sequences@ record types@ and field formats to be used for the electronic exchange of check adjustment messages. The standard format supports check related adjustment notices and requests for individual checks@ bundles of checks@ check cash letters and attachment of images. It supports the full range of adjustment types currently in use by financial institutions and will support web-based or mainframe system transmission. The standard may be used whether or not the particular check@ bundle of checks@ or cash letter was presented via paper or via an electronic check exchange file. The informative annexes attached to this standard provide information@ which may prove useful to those planning on implementing the standard. This standard does not address certain operational@ implementation@ or settlement issues. These issues may include@ but are not limited to a choice of: data and image compression@ encryption@ and transmission specifications and data representation. This standard should not replace return functionality as documented in the ANSI X9.100-187 Exchange of Check and Image Data-Domestic specification. Purpose and application The purpose of this standard is to provide a structure to facilitate the electronic exchange of check adjustment information for the purposes of providing notification of adjustments@ requesting adjustments@ requesting information@ and requesting documentation. While this standard specifies a file transmission environment@ the case related records provide the necessary information for processing adjustments in other environments. All records will be variable record length (beyond 80 bytes). For@ example@ the standard may be utilized by web-based adjustment message systems to facilitate the creation and transmission of electronic adjustment messages. If providers of web-based adjustment message systems also wish to receive or send adjustment files that conform to this standard@ special attention should be given to usage conditions assigned to fields in the following records: File Header Record (Type 01) Batch Header Record (Type 10) Case Control Record (Type 70) Batch Control Record (Type 90) File Summary Record (Type 99) Certain processing systems may require an indication of the number of characters in each record. In this case@ by agreement between the parties an inserted length field may be added at the beginning of each record as described in Annex L.