Compiler Error AL0922

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The method '{0}' cannot be used as the implementation for the interface method '{1}' because it has 'OnPrem' scope.

Description

Interface implementations cannot have OnPrem scope because interfaces can be invoked in cloud environments where OnPrem methods are not available.

Remarks

Interface methods can be called from any environment, including cloud (SaaS). A method marked with [Scope('OnPrem')] is only available in on-premises deployments. If such a method implements an interface, calling the interface from a cloud environment would fail at runtime.

How to fix it

Remove the [Scope('OnPrem')] attribute from the implementing method. If the method contains on-premises-only logic, refactor it so the interface implementation works in all environments.

Example of code that triggers AL0922

interface IDataExporter
{
    procedure Export(data: Text);
}

codeunit 50100 FileExporter implements IDataExporter
{
    // Error: OnPrem method cannot implement an interface method.
    [Scope('OnPrem')]
    procedure Export(data: Text);
    begin
        // File I/O that only works on-premises
    end;
}

Example of how to fix it

Remove the OnPrem scope and use cloud-compatible APIs, or redesign your feature.

interface IDataExporter
{
    procedure Export(data: Text);
}

codeunit 50100 FileExporter implements IDataExporter
{
    procedure Export(data: Text);
    var
        TempBlob: Codeunit "Temp Blob";
    begin
        // Use cloud-compatible approach
    end;
}

Related information

Getting started with AL
Developing extensions
Interfaces in AL