Edit_Attachment method of CL_GOS_DOCUMENT_SERVICE

Hi ABAPers,
I have used the method create_attachment of the class CL_GOS_DOCUMENT_SERVICE and i am able to attach the file.
but i have a need to edit the attached file.
Anybody can please tell me that how i may use the edit_attachment of the same class? It would be good for editing the filename?
Please also tell me what i have to pass in the parameters of the method edit_attachment for ip_attachment.
Thanks
Dhananjay

Am i Asking the wrong question or am i at wrong place for this type of questions??
Please help me Gurus, I am new to this SAP and fresher also.
Regards
Dhananjay

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