sh404sef extension for ext_advertisement
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Tested with Joomla 3.8, ext_advertisement,

Installation:
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In the folder /components/com_advertisementboard create a subfolder sef_ext, like this
/components/com_advertisementboard/sef_ext

Now using FTP or similar, drop the file com_advertisementboard.php into that sef_ext directory.

Now you have very nice SEF URL's for Advertisementboard in the frontend.

