[SalesForce] rollup summary fields filter criteria

I am trying to create a rollup summary field on master object.
I can create it fine.But when i try to impose a filter on child records for rolling up,
i cannot see all fields listed there.Say for example in my child object,there is a lookup relationship to Opportunity and want to rollup those records whose opportunity__c is not null.I cannot even see the field list.
I do have another field for contact lookup and ie listed.

Is there a particular criteria for fields coming there?

Best Answer

The About Roll-Up Summary Fields documentation says:

Long text area, multi-select picklist, Description, system fields like Last Activity, cross-object formula fields, and lookup fields (such as the Product Code field) cannot be used in the field column of roll-up summary filters.

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