SAP PO - File name selection SFTP connection

Hi All

I am currently having an issue while configuring a Communication Channel in PO.

The connection is to an SFTP server which will contain files posted every 2 hours, the file format will XX_XXXXXXXXX.xml so an example would be DR_201612111.xml (every file will be unique.

However, in the file section I cannot seem to use a place holder as PO does not recognise the file - for example DR_*, *DR_, *.xml etc. The only way I can get this to work is by specifying a particular file which will not work.

Does anyone know how I can solve this?

My system version is: PO 7.4

Many Thanks

Phil