TPT stream operator

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TPT stream operator

I am using a serialize option in my tpt  stream operator script, we have multiple reader instance in our script,

SERIALIZE ON(ACCT_NB)

TO OPERATOR (File_Loader[4])

SELECT * FROM OPERATOR(File_Reader[1])

UNION ALL

SELECT * FROM OPERATOR(File_Reader2[1])

UNION ALL

SELECT * FROM OPERATOR(File_Reader3[1])

UNION ALL

SELECT * FROM OPERATOR(File_Reader4[1]);

);

);

The Script fails with the error File_Loader: TPT16125: Serialize On and multiple instances are mutually exclusive.   Any inputs on this?