Answer / bikas

WS_UPLOAD will not work in case of background
As background jobs run in application server and WS_UPLOAD
is the FM which require input from the Prsentation server,
so it will not get the file at run time and will give error.

Answer / sunil

You have to use data set.

Answer / sumit nene

Consider that there the file is on your or any desktop. Now
if during background process, your system is turned off,
what will happen? The report will not find the file and
it'll result in error!

That is why you cannot perform "any" task in background
that has to interact with presentation server.

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