OracleSOA - File Adapter - Correct mechanism to get the line number from the file

We are using Oracle SOA process to read data from a file, process the data and write it to the database. SOA process is created using Oracle File Adapter to read the data, Oracle BPEL to transform & process the data and Oracle DB Adapter to write the data into the database.
Oracle File Adapter uses native schema to process the fixed length data in the file. The number of rows in the file may exceed more than 500,000, to support processing of large files we use chunk size in the file adapter as 4000 rows. In each read operation, file adapter reads the data that matches to the schema, there might be few rejected rows as well.
Oracle File Adapter property - jca.file.LineNumber gives me only the line number till what line the data is read. Is there any way to get the line number in the xml message, which exactly matches to the line number in the file.?
Flat File Format: (Every file has one header, trailer and multiple data lines),
HEADER02 -
L01
L01
L01
TRAILER02
Line number is one of the crucial requirement in the development of the SOA service, this is used to back trace the information from which source and line the data has come.

Hi Anshul,
Thanks for sharing your thoughts.
I am using DB adapter to insert the data into db.
While doing the xsl transformation I can get the index of the message using position(), but that is not the correct way as there can be rejected lines by the file adapter.
Even if I maintain a local counter variable, it will not consider rejected lines and increment that, which is not correct.
Thanks,
Ravindra

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OracleSOA - File Adapter - Correct mechanism to get the line number from the file

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