BUI: Cancel Save on Incident workspace based on condition

Content

Hi All,

I have an requirement to disable/Cancel Save.

1. Created dropdown and button in BUI and uploaded in incident workspace tab.

2. Based on the dropdown value i displayed one error message on the button click

after displayed the error message i want to disable Save button, I used the below code but it is not working

ORACLE_SERVICE_CLOUD.extension_loader.load("CUSTOM_APP_ID" , "1")
        .then(function(extensionProvider)
            {
            extensionProviderIExtensionProvider.registerWorkspaceExtension(function(WorkspaceRecord)
                {
                WorkspaceRecord.addRecordSavingListener(customImplementation);               
                }
            );
            }
);
function customImplementation(parameter)
    {
    // Custom implementation goes here.
    parameter.getCurrentEvent().cancel();
    }