Hi Krish,
Once 'FILE_NAME_17JUL2014.xlsx' is loaded to HANA then next again you will not load the previous day file right? only you will load latest file which is not loaded?
Try creating global variable like $G_FILE_NAME
Before your data flow create scirpt like below
$G_FILE_NAME = 'FILE_NAME_'||sysdate()||'.xlsx';
now the file name value is assigned to $G_FILE_NAME. Use this $G_FILE_NAME in your fileformat instead of filename.
this will take current date file file.
if you need any info, let me know.
Thanks & Regards,
Balamurugan G