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Mapping WhatId to External ID

All I am currently creating an SDL for CLI Dataloader and I am having an issue resolving one mapping. I want to upsert Events that are related to Opportunities using the opportunity external ID. I have done this with Opportunities to accounts, but it is not working with WhatID to Opportunity External ID.


Any suggestions?




As of now with data loader it not possible to map the polymorphic field WhatId on task/event. There is an idea posted for this on ideaexchnage, i would suggest you to vote this idea if you wish to have this functionality in near future: