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Microsoft Dynamics CRM (Archived)

Updating subject field using business rule is causing an error

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I'm using a business rule to populate the subject field based on the value in a lookup on the case entity and I'm getting the following error message - 'Lookup Control Error: Cannot add item of typename = to the lookup control' when the business rule attempts to populate the subject field.  The business rule works on an older on premise version of CRM (v8.1.0.359) but not on the latest online version (v8.1.0.252).  I have followed the recommendations in the following post https://atriosystems.wordpress.com/2016/04/18/fix-lookup-control-error-after-upgrade-to-crm-13/ and have even imported the working subject entity from the on prem system into the v8.1.0.252 system but it still is not working.  Any ideas how to resolve this?

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