Insert Blank Row after writing record to .csv

J Developer 11.1.1.6.0
Oracle SOA 11g - BPEL
I am currently performing 3 separate transformations in a bpel process.
In the first transformation I extract header level information (only 1 record line) and write this to a csv file together with HEADERS.
In the second transformation I extract Detail level information (1 or more record lines) and APPEND this to the same csv file mentioned above together with HEADERS.
In the third transformation I extract Footer level information (only 1 record line) and APPEND this to the same csv file mentioned above together with HEADERS.
an example of the resulting csv file (opened in Excel)
=========================================
|FILENAME     |DATE          |NUMBEROFRECORDS|     <-------------- 1st Transform HEADER
|Dummy File    |08082013   |3                                     |     <-------------- 1st Transform RECORD DATA
|DOCREF        |VAT            |AMOUNT                       |     <-------------- 2nd Transform HEADER
|1                     |30               |100                                 |     <-------------- 2nd Transform RECORD DATA
|2                     |20               |200                                 |     <-------------- 2nd Transform RECORD DATA
|3                     |10               |300                                 |     <-------------- 2nd Transform RECORD DATA
|TOTALDOCS |TOTALVAT|TOTALAMOUNT            |     <-------------- 3rd Transform HEADER
|3                     |60               |600                                 |     <-------------- 3rd Transform RECORD DATA
========================================
REQUIREMENT : I NEED TO INSERT A BLANK LINE/ROW BEFORE THE DETAIL HEADER AND ANOTHER BLANK LINE/ROW AFTER THE LAST DETAIL RECORD.
i.e. . The resulting file should look as follows :-
=========================================
|FILENAME     |DATE          |NUMBEROFRECORDS|     <-------------- 1st Transform HEADER
|Dummy File    |08082013   |3                                     |     <-------------- 1st Transform RECORD DATA
|                       |                   |                                       | <----------------------------------------------------------------- INSERT FIRST BLANK LINE/ROW
|DOCREF        |VAT            |AMOUNT                       |     <-------------- 2nd Transform HEADER
|1                     |30               |100                                 |     <-------------- 2nd Transform RECORD DATA
|2                     |20               |200                                 |     <-------------- 2nd Transform RECORD DATA
|3                     |10               |300                                 |     <-------------- 2nd Transform RECORD DATA
|                       |                   |                                       |<----------------------------------------------------------------- INSERT SECOND BLANK LINE/ROW
|TOTALDOCS |TOTALVAT|TOTALAMOUNT            |     <-------------- 3rd Transform HEADER
|3                     |60               |600                                 |     <-------------- 3rd Transform RECORD DATA
========================================
This is straight forward to perform in Excel once the file is opened, but my requirement is to have the file opened in the format displayed above without Human intervention.
Is it possible to accomplish this?
Any advise/guidance will be highly appreciated.
Thanking you in advance

Hi Vlad
Sorry for this late response, I will attempt what you have suggested.
Its just that the project that this query is related to was put on the back burner...
I will provide feedback regarding the outcome soon...
Regards

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