Transferring empty flat file

My problem is to transfer an empty flat file between 2 nodes, using Webmethods 6.0.

The only presence of the file for the recipient triggers a statement.

The WmFlatFile package is available, but when describing the format of the file in the schema flat file, what is the way used to describe an empy file ? If the fieds are let blank and the record of fixed length, the following error occcurs when executing the flot service which loads the file: “com.wm.app.b2b.server.ServiceException: Input parameter ffData cannot be null.”

If it doesn’t matter what the file contains, perhaps just putting a couple chars or two in the file will satisfy the FF adapter.