Auto invoice program running but no invoice

I am running the auto invoice programing and its getting completed w/o any error but no invoice is getting generated.what could be the reason

You have to check Autoinvoice Import Program output file becuase it will show you why interface reject your transactions some time happenes Period is not Open etc.So you have to first check output or log file for Error Reason. ThanksAnkur Modi.  

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