If the Flat File composer receives an empty class, it produces an empty line. You should prevent creating empty classes by using the exists() Operation.

The options ignoreEmptyRecords and ignoreEmptyStrings on the flat file record definitions only apply to flat file parsing. For flat file composing they have no effect.

So, for flat file composing you need to check if the flat file record contains data when building the flat file structure, e.g. by using the exists() Operation.

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