When customers are testing the generation of invitation files, they do not want invitations to be actually imported and sent. All they want is to check if the format is correct. If some invitations have already been imported, the re-invitation rule may start to prevent new invitations from being imported. The re-invitation rule exists to avoid that end customers receive several invitations to surveys in a short time. This article describes how to validate the format without having to worry about the re-invitation rule.
If all you want is to validate the file format, you must create a test file. An invitation test file looks like a regular invitation file, but its name indicates to the system that its content should not be used to create actual invitations. All you need to do is create the file and append _RTTESTONLY to its name. For example, instead of Sales_AS_20201130_090000.csv, your file will be named Sales_AS_20201130_090000_RTTESTONLY.csv.
When this file is processed, a report will be generated to check if it is valid or if there are errors.