I guess the answer came in this blog
post:
http://googleadsdeveloper.blogspot.se/2013/11/increase-sitelinks-performance-with.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+GoogleAdsDeveloperBlog+(Google+Ads+Developer+Blog)
Just remove the old FeedMapping and add a new one with containing both the
old and new field mapping attributes.
Den onsdagen den 6:e november 2013 kl. 14:58:52 UTC+1 skrev Magnus Ljung:
>
> Hi,
>
> I have a feed for sitelinks with mappings for the text and url fields. Now
> I see that the description 1 and 2 fields are generally available through
> the API. So I would like to add those attributes to my feed and the
> corresponding attribute field mappings to my FeedMapping.
>
> It worked great to add new attributes to the feed, but I can't figure out
> how to add more attribute field mappings to an existing feed mapping.
>
> I tried with an ADD operation, but, not surprisingly, the API responded
> with FeedMappingError.MULTIPLE_MAPPINGS_FOR_PLACEHOLDER_TYPE.
>
> I also tried with SET, which seems more logical, but the API responded
> with OperatorError.OPERATOR_NOT_SUPPORTED.
>
> Is it possible to add attribute field mappings to an existing FeedMapping?
> If not, what is the recommended way to add support for description fields
> for sitelinks?
>
> Regards
> Magnus Ljung
>
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