rename operation to operationName

Change-Id: I6e8f87b40f0bac3a6e50b923cf260f721abc9e07
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
add a location hint to a warning

Change-Id: Ieaa10ff2e7f20dbdccbddf707923619756fea35e
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>