feature writer dataset name based on attribute value

It sounds like you are sending one feature with the attribute into the writer, but all other features that are entering the feature writer don't have the attribute populated. All features that need to be written to the file must have the attribute populated. If you are using @Value(myattribute) as a fanout but have the flow set up like below, you will get a file correctly named but mostly blank, and a file incorrectly named but with all the data in

You need to merge the streams before writing

Thank you ebygomm for the answer, I am reading from GML file and writing to DWG file, I would like to write to a DWG file with a Layers per feature. (I have like "one to one" connection) I can read the attribute in the Reader (when I log the initiator) if I add it to each feature, I don't have an error int the Writer but when I run it, the attribute value is empty ("") ... (something like this)

If the information is in your initiator for your feature reader, under attribute and geometry handling choose merge initiator. This will mean all the features read have a populated attribute for writing

If the information is in your initiator for your feature reader, under attribute and geometry handling choose merge initiator. This will mean all the features read have a populated attribute for writing

merging initiator and results worked for me, thank you!