If a gatekeeper file needs to be re-created from a posted invoice's you can do this from the gatekeeper user code.
Files can be created from the original group ID or the individual invoice number.
Open the User Defined Codes Maintenance screen
Load the gatekeeper user code GK_Config user code
Navigate to the ExpTest user code
In the Description field (the field that state Ready) type in the InvoiceNum or GroupID that you would like to re-create files for and press save.
The description field should automatically reset to Ready and the file will be created in the defined location.