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How to check pc file path validity?

Hi,

In my program I have to extract so much SAP data and write in a file in the fornt-end PC. In the selection screen I will input the filepath\name to write the data.

But how should I check whether the filepath is valid or not in the 'AT SELECTION-SCREEN' event itself? so that if it is not valid path, I can give an error message before extracting all the SAP data.

Thank you!

Sunitha.

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