This documentation is organized under the following headings:

Natural System Error Messages	Explains the system error messages that may be issued by the Natural nucleus. Library-specific messages and messages relating to other Software AG products are not included.
GETMAIN Error Numbers in NAT7545	Contains the error numbers which are displayed in Error Message NAT7545 as a result of a failed GETMAIN request.
FREEMAIN Error Numbers in NAT7546	Contains the error numbers which are displayed in Error Message NAT7546 as a result of a failed FREEMAIN request.
Compression/Decompression Error Messages	Contains the error messages (NUS02nn) that may be issued by the Natural thread compression/decompression routine as a result of user session errors.
Natural Global Buffer Pool Manager Messages	Contains the informational and error messages issued by the Natural Global buffer pool manager under z/OS and z/VSE.
Optimize Monitor Buffer Pool Messages	Contains the messages that may be issued by the Optimize Monitor Buffer Pool.
Message Buffer Pool Messages	Contains the messages that may be issued by the Message Buffer Pool.
Roll Server Messages	Contains the messages that may be issued by the Natural Roll Server. *
Return Codes and Reason Codes of the Roll Server Requests	Contains the return codes and reason codes of the roll server requests. *
Authorized Services Manager Messages	Contains the messages that may be issued by the Natural Authorized Services Manager. *
SIP Service Return Codes and Reason Codes	Contains the return codes and reason codes of the Session Information Pool Service requests. *
RPC Server Front-End Messages	Explains the messages that may be issued by the RPC server front-end. *
Natural under Com-plete/SMARTS User Abend Codes	Contains the abend codes issued by the Natural Com-plete/SMARTS Interface. *
Natural under CICS Messages	Contains the abend codes, SCP environment initialization errors, SCP environment recovery errors, SCP processing errors and the session errors issued by the Natural CICS Interface. *
Natural under IMS TM Error Messages	Contains the error codes and messages that may be issued by the Natural IMS TM Interface. *
Natural under TIAM Error Messages	Contains the error messages that may be issued by the Natural TIAM Interface, listed in groups of NRT and NUI messages. *
Natural under openUTM Error Messages	Contains the error messages that may be issued by the Natural openUTM Interface, listed in groups of NUI, NUS and NUW messages. *
Error Messages from the Natural Swap Pool Manager Valid under CICS and openUTM	Contains the error messages (NUS01nn) that may be issued by the Natural swap pool manager as a result of user session errors. *
Static Generation Messages and Codes Issued under NDB/NSQ	Lists the error messages that may be issued during static generation under Natural for DB2 or Natural for SQL/DS
Natural for DL/I Interface Status Codes and Abend Codes	Contains information on status codes and explains the abend codes that are used under CICS only. *
Natural for VSAM Interface Abend Codes	Explains the abend codes that may be issued by Natural for VSAM. *
Entire Transaction Propagator Abend Codes	Explains the abend codes that can occur during the operation of the Entire Transaction Propagator CICS Interface (product code: ETC). *
Natural Advanced Facilities BS2000/OSD Error Messages	Contains the messages that may be issued by the front end, monitor, printer task (print server) or the SERVEND program. *
Natural under BS2000/OSD Batch Error Messages	Contains the error messages that may be issued by the Natural BS2000/OSD batch driver. *
Messages from Program CMPSTART	Contains the error messages (CMPnnnn) that may be issued by the program CMPSTART whose task is to start global common memory pools in Natural under BS2000/OSD. *
Print File/Work File Server NATPWSV2 Error Messages	Explains the error messages from the print file/work file server NATPWSV2 for an RPC batch server environment under BS2000/OSD. *

Note:
* Unlike Natural system messages, the explanatory long texts to these messages and codes are only available in this document, not online.

Notation vrs or vr:

When used in this document, the notation vrs or vr represents the relevant product version (see also Version in the Glossary).