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Can't figure out how to make a Custom Field appear in the "Aggregate" picklist for a Rollup Formula

I created a custom field at the opportunity product level called "Year 1 summary". It's a number calculated off other things. Can't seem to get it to appear in the Aggregate Picklist when I create a Roll Up Summary field at the opportunity level.


Any Advice would be appreciated.




you can't use formula fields to build up standard rollup fields. 

You need to create a physical field (number) and then you could use a workflow to calculate that field (if the fields used in the calculation are in the same object otherwise you need a trigger to do that calculation). Then you can rollup that field to the Opportunity level.