The Application ID
The application ID component identifies the application that a specified file or field is associated with. This allows you, for example, to compare the value of a field in one application to that of a field in a second application. All the statement types that allow you to specify files or fields require you to provide the corresponding application ID. Note that, when you refer to any of the predefined fields (PDFs) in a statement, you enter “---” (three hyphens) as the application ID. When you specify a constant (such as when adding the value 3 to a designated numeric field), you leave the application ID as spaces. The following is an example of an application ID reference:
The component TAR refers to the application ID in which the RECEIPT1 file is defined.
When you are entering new ILF code with an application ID component, the application ID defaults to the current application but you can override it. APPX automatically changes the application ID to "---" if the referenced field (or file or process) cannot be found in the application specified but does exist in application 0LA, the runtime application. This lets you refer to predefined fields, files, or processes without having to change the application ID.