Generating File Names
Use
The function modules which generate a file name when IDocs are exchanged using a "file" port are stored here. These function modules are displayed as a list of possible entries (F4) when you create a "file" port. The standard system already contains some examples of such function modules. You can store your own function modules here.
Activities
The function modules are maintained by choosing SAP Menu
® Tools ® Business Communications ® IDoc Basis ® Control ® Generate File Name.
The function module must return directory and file as a character string. It can transfer the directory from the port definition (as the standard modules do), but does not have to.