What does the Campaign Member 1000 error status mean?

Campaign Members are an odd object. They don't *just* use one single picklist on the object like all other picklists (which has the 1,000 limit you see there). They actually generate records for every status value on every campaign (CampaignMemberStatus). You can have a related list of them on your layout.

So if you use 'Attended' in 3 campaigns, it is 3 records. Is it the best model? Probably not, but it isn't something we can control. And it's one of those things Salesforce doesn't make obvious; it's not even listed in the schema builder, storage or usage-based entitlements in setup. 

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