FTP Adapter - Reading File Name that changes for each instance

We often end up in some business requirements where we need to read a file or write to a file where file name is decided based on the message of the instance.

Consider an example where we have one order process which calls another application asynchronously to validate the order. If the validation is successful , it places a file in a FTPshare with name _Success.xml else _Failed.xml. Now the Order process instance will need to read the file from that FTP share. So here the requirement is to read a file whose name would change for every Order ( ie., for every instance).
So here we need to dynamically change the "file name" of the FTPAdapter configuration.

Providing FileName Dynamically :

1. Create a OutboundHeaderVar(lets say outHeaderVar) in the scope. This is of messageType {http://xmlns.oracle.com/pcbpel/adapter/ftp/}OutboundHeader_msg. (Or) you can select the message Type -> click on browse -> Type Explorer -> Project WSDL files -> Select ftpAdapterOutboundHeader.wsdl -> MessageTypes->OutboundHeader_msg.

2. Drag an assign activity and select the from-spec query like for eg : concat('bpws:getVariableData("orderNumber")','_Success.xml').In the To-Spec Query select
outHeaderVar/outboundHeader Query = "/ns2:OutboundFTPHeaderType/ns2:fileName"

This will assign the file name as required at the design time dynamically.