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If you set "Filename" to '%f', the output file name will be the same as the input file name and records from one input file will be appended to an output file with the same name.
For a simple message transformation flow example, I would go for record map :
- you get readymade service (EnsLib.RecordMap.Service.FileService) and operation (EnsLib.RecordMap.Operation.FileOperation) in the library to read and write CSV files and
- a mecanism that generates an appropriate message class based on a declarative definition (see Using the Record Mapper | Developing Productions | InterSystems IRIS Data Platform 2022)
So you can focus on DTL and the whole flow can be done from the administration portal, look ma, no code ;-)
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For simple headers (and footers), you can use the 'batch class' feature of the record map file batch service (EnsLib.RecordMap.Service.BatchFileService) and operation (EnsLib.RecordMap.Operation.BatchFileOperation), and a class such as EnsLib.RecordMap.SimpleBatch to specify a header string.