ALE/IDOC within system/client

Hi experts,

I know IDOCs are use for communication with other systems. Is it possible to have an ALE scenario for use inside one system, i.e. a specific document like an order is saved and automatically an IDOC output is created and processed as input for another process (like customer-specific financial document?).

Until now, I know only inbound and outbound processes but I don't know if it is possible the same system as input and output at the same time.

Any ideas about possible solutions welcome!

Thanks in advance

Clemens Li