Why is my Change Field Type button missing on Master Detail fields?
|Knowledge Article Number||000176349|
|Description||In some instances your Change Field Type button may be missing when trying to change a master detail field into a lookup field.|
|Resolution||This is generally due to one of the following:
a) The master object has an existing Roll Up Summary field for data on the child object. In this case it is necessary to delete the Roll-Up Summary field on the parent object to permit the Master-detail field type to be changed.
b) There is a cross object Workflow Field Update defined for the child object to update a record on the parent. Cross object field updates only work on master detail relationship. In this case it is necessary to delete the cross-object field update to permit the Master-detail field type to be changed.