No documentation for SAPScript Address function

What is SAPScript Address function ADDRESS_INTO_PRINT? We have spent numerous hours trying to determine how or if the PO Box city is used in this function. We finally found an OSS note identifying parameter "CITY" to be used to correct our problem.
The question is: Where is the documentation listing all available parameters and their use? It certainly is not in the function doc, or any manuals I've seen?

This is a common problem. There is much information which would be helpful, that SAP either don't have, or haven't released. I guess the documentation is probably in the vaults of Walldorf somewhere!