When importing a Managed Solution into CRM 2011 RU16 OnPremise getting error :-
A managed solution cannot overwrite the OptionSet component with Id=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX which has an unmanaged base instance. The most likely scenario for this error is that an unmanaged solution has installed a new unmanaged OptionSet component on the target system, and now a managed solution from the same publisher is trying to install that same OptionSet component as managed. This will cause an invalid layering of solutions on the target system and is not allowed.
This has only appeared after RU16. The optionset named 'rasv_document_leftvoicemail'. The entity 'Document' is a Custom Activity Entity. I'm fairly sure this is related to the 3 fixes that Microsoft applied in RU16 relating to the LeftVoiceMail fields (which I think was related to a problem with upgrading from CRM 2011 to CRM 2013). We have also seen this in another Solution with the optionset named 'adx_rating_leftvoicemail' which is also a custom Activity entity.
I think I could 'hack' a solution in by inserting items into the metaschema tables, but really don't want to.
Has anyone else had this problem?