Transitioning from Codeunit 1 to System Codeunits

With Business Central, codeunit 1 Application Management has been removed and replaced with new System codeunits. No functionality has been removed by this change. All system method triggers, event publishers, and their code have been moved to other codeunits.

However, this change will affect the upgrade process from Dynamics NAV and how you develop going forward.


The foundation of this change is events - publishers and subscribers. System codeunits do not contain code. They only contain event publishers. Instead of running codeunit 1 and calling respective functions, Business Central Server runs system codeunits. The system codeunits will in turn raise published events. There are various management codeunits that subscribe to these events. Like codeunit 1, these subscriber codeunits contain method triggers and integration event publishers, which means that they can call application functionality and raise events. The following figure illustrates the process:

System event publishers

About system codeunits

  • They have IDs in the 2 billion range.
  • You cannot modify them.
  • Currently, we do not recommend that code subscribes to the events in the new system codeunits 2000000001..2000000010 directly. Although this is not blocked, it might be in a future release. Instead, you should subscribe to one of the integration events which now reside next to the business logic.

Mapping Codeunit 1 method triggers to events

The following table lists the mappings between the codeunit 1 triggers and event publishers and the new method trigger and publishers in the management codeunits.

Codeunit 1 trigger New Codeunit ID New method
CompanyClose 40 CompanyClose
CompanyOpen 40 CompanyOpen
GetSystemIndicator 40 GetSystemIndicator
OnAfterCompanyClose 40 OnAfterCompanyClose
OnAfterCompanyOpen 40 OnAfterCompanyOpen
OnBeforeCompanyClose 40 OnBeforeCompanyClose
OnBeforeCompanyOpen 40 OnBeforeCompanyOpen
FindPrinter 44 GetPrinterName
ApplicationVersion 9015 ApplicationVersion
CustomApplicationVersion N/A N/A
ReleaseVersion 9015 ReleaseVersion
ApplicationBuild 9015 ApplicationBuild
CustomApplicationBuild N/A N/A
ApplicationLanguage 43 ApplicationLanguage
DefaultRoleCenter 9170 DefaultRoleCenterID
MakeDateTimeText 41 MakeDateTimeText
GetSeparateDateTime 41 GetSeparateDateTime
MakeDateText 41 MakeDateText
MakeTimeText 41 MakeTimeText
MakeText 41 MakeText
MakeDateTimeFilter 41 MakeDateTimeFilter
MakeDateFilter 41 MakeDateFilter
MakeTextFilter 41 MakeTextFilter
MakeCodeFilter 41 MakeTextFilter
MakeTimeFilter 41 MakeTimeFilter
AutoFormatTranslate 45 AutoFormatTranslate
ReadRounding 45 ReadRounding
CaptionClassTranslate 42 CaptionClassTranslate
GetCueStyle 9701 GetCueStyle
SetGlobalLanguage 43 SetGlobalLanguage
ValidateApplicationlLanguage 43 ValidateApplicationLanguage
LookupApplicationlLanguage 43 LookupApplicationLanguage
GetGlobalTableTriggerMask 49 GetGlobalTableTriggerMask
OnGlobalInsert 49 OnGlobalInsert
OnGlobalModify 49 OnGlobalModify
OnGlobalDelete 49 OnGlobalDelete
OnGlobalRename 49 OnGlobalRename
GetDatabaseTableTriggerSetup 49 GetDatabaseTableTriggerSetup
OnDatabaseInsert 49 OnDatabaseInsert
OnDatabaseModify 49 OnDatabaseModify
OnDatabaseDelete 49 OnDatabaseDelete
OnDatabaseRename 49 OnDatabaseRename
OnDebuggerBreak 9500 ProcessOnDebuggerBreak
LaunchDebugger 9500 OpenDebugger
OpenSettings 9170 OpenSettings
OpenContactMSSales 50 OpenContactMSSales
InvokeExtensionInstallation 2501 InvokeExtensionInstallation
CustomizeChart 9180 CustomizeChart
HasCustomLayout 44 HasCustomLayout
MergeDocument 44 MergeDocument
ReportGetCustomRdlc 44 ReportGetCustomRdlc
ReportScheduler 44 ScheduleReport
OnBeforeOpenSettings 9170 OnBeforeOpenSettings
OnAfterGetApplicationVersion 9015 OnAfterGetApplicationVersion
OnRoleCenterOpen 9170 OnRoleCenterOpen
OnAfterGetSystemIndicator 79 OnAfterGetSystemIndicator
OnAfterFindPrinter 44 OnAfterGetPrinterName
OnAfterGetDefaultRoleCenter 9170 OnAfterGetDefaultRoleCenter
OnAfterMakeDateText N/A N/A
OnAfterMakeTimeText N/A N/A
OnAfterMakeText N/A N/A
OnAfterMakeDateTimeFilter 41 OnAfterMakeDateTimeFilter
OnAfterMakeDateFilter 41 OnAfterMakeDateFilter
OnAfterMakeTextFilter 41 OnAfterMakeTextFilter
OnAfterMakeCodeFilter N/A N/A
OnAfterMakeTimeFilter 41 OnAfterMakeTimeFilter
OnAfterAutoFormatTranslate 45 OnAfterAutoFormatTranslate
OnAfterCaptionClassTranslate 42 OnAfterCaptionClassTranslate
OnAfterGetGlobalTableTriggerMask 49 OnAfterGetGlobalTableTriggerMask
OnAfterOnGlobalInsert 49 OnAfterOnGlobalInsert
OnAfterOnGlobalModify 49 OnAfterOnGlobalModify
OnAfterOnGlobalDelete 49 OnAfterOnGlobalDelete
OnAfterOnGlobalRename 49 OnAfterOnGlobalRename
OnAfterGetDatabaseTableTriggerSetup 49 OnAfterGetDatabaseTableTriggerSetup
OnAfterOnDatabaseInsert 49 OnAfterOnDatabaseInsert
OnAfterOnDatabaseModify 49 OnAfterOnDatabaseModify
OnAfterOnDatabaseDelete 49 OnAfterOnDatabaseDelete
OnAfterOnDatabaseRename 49 OnAfterOnDatabaseRename
OnAfterHasCustomLayout 44 OnAfterHasCustomLayout
OnAfterReportGetCustomRdlc 9650 OnAfterReportGetCustomRdlc
OnBeforeOnDatabaseInsert 49 OnBeforeOnDatabaseInsert
OnBeforeOnDatabaseModify 49 OnBeforeOnDatabaseModify
OnBeforeOnDatabaseDelete 49 OnBeforeOnDatabaseDelete
OnBeforeOnDatabaseRename 49 OnBeforeOnDatabaseRename
OnEditInExcel 6710 OnEditInExcel
OnInstallAppPerDatabase N/A N/A
OnInstallAppPerCompany N/A N/A
OnCheckPreconditionsPerDatabase 9900 OnCheckPreconditionsPerDatabase
OnCheckPreconditionsPerCompany 9900 RaiseOnCheckPreconditionsPerCompany
OnUpgradePerDatabase 9900 OnUpgradePerDatabase
OnUpgradePerCompany 9900 OnUpgradePerCompany
OnValidateUpgradePerDatabase 9900 OnValidateUpgradePerDatabase
OnValidateUpgradePerCompany 9900 OnValidateUpgradePerCompany

What does this mean for upgrade?

For a full upgrade (application code and data), you have to move any custom logic that was included in the old codeunit 1 into the management codeunits and methods described in the previous section. Any custom code that called into codeunit 1 will also have to be changed to call or subscribe to the new methods. You can this as part of the application code upgrade.

For a technical upgrade, after you convert your old database to the Business Central platform, you must import and compile a replacement codeunit 1 object, which you can get from Codeunit 1 Replacement.

See Also

Converting a Database