Webdav Fatal: external storage wrongfully seen as local directory

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I’m facing repeatedly this log entry:

[webdav] Fatal: OCA\DAV\Connector\Sabre\Exception\Forbidden: No read permissions at <<closure>>

 0. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php line 195
    OCA\DAV\Connector\Sabre\Directory->getChildren()
 1. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 899
    Sabre\DAV\Tree->getChildren("files/USERNAME/Algemeen Sales")
 2. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 978
    Sabre\DAV\Server->generatePathNodes(Sabre\DAV\PropFind {}, [Sabre\DAV\PropF ... }])
 3. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 1666
    Sabre\DAV\Server->getPropertiesIteratorForPath("files/USERNAME/Algemeen Sales", ["{DAV:}resource ... "], 1)
 4. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 355
    Sabre\DAV\Server->generateMultiStatus(Generator {}, false)
 5. <<closure>>
    Sabre\DAV\CorePlugin->httpPropFind(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
 6. /var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php line 105
    undefinedundefinedcall_user_func_array([Sabre\DAV\CorePlugin {},"httpPropFind"], [Sabre\HTTP\Requ ... }])
 7. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 479
    Sabre\Event\EventEmitter->emit("method:PROPFIND", [Sabre\HTTP\Requ ... }])
 8. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 254
    Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
 9. /var/www/nextcloud/apps/dav/lib/Server.php line 317
    Sabre\DAV\Server->exec()
10. /var/www/nextcloud/apps/dav/appinfo/v2/remote.php line 35
    OCA\DAV\Server->exec()
11. /var/www/nextcloud/remote.php line 163
    undefinedundefinedrequire_once("/var/www/nextcl ... p")

PROPFIND /remote.php/dav/files/USERNAME/Algemeen%20Sales%20(2)
from 10.10.10.10 by USERNAME at 2019-11-19T08:16:53+00:00

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Nextcloud version: 17.0.1
Operating system and version: Ubuntu 16.04
Apache version: 2.4.18
PHP version: 7.2

This folder Algemeen Sales is an external SMB storage which is shared with USERNAME. As I can see from the log, this directory is seen as local directory for USERNAME (files/USERNAME/Algemeen Sales) which is not in this place hence the error.
How can I adjust some settings in Nextcloud so It does know that this is an external storage and not local? I’m not facing any issues besides this error entry. The user can access the external directory Algemeen Sales without any problem.