My CRM 2016 On-prem instance contains a custom activity entity "Special Request" that was created in CRM in ver. 2011.
We upgraded from 2011 to 2013, then to 2015, and 2016.
When I export the "Special Request" custom activity as part of a Solution, that Solution cannot be imported into another Organization.
The solution import fails on the field "sendermailboxid". Error message: "Invalid name for field 'sendermailboxid'. Custom field names must start with a valid customization prefix. The prefix for a solution component should match the prefix that is specified for the publisher of the solution."
Note:
-Customized activities were introduced in CRM 2011.
-The Mailbox entity was introduced in CRM2013.
-The sendermailboxid field was added in the 2013 upgrade.
I cannot delete the "sendermailboxid" field from the entity because it was added by the system as a standard activity field.
I cannot delete this custom activity entity "Special Request" because it is now part of the Default Solution.
I can create new custom activity type entities in 2016 that when exported in a solution, can successfully be imported into different organizations.
How can I get rid of this entity so I can recreate it as a new entity without the problems from being a 2011 holdover?
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