Considerations when changing the type of a custom field
Occasionally, after you have created custom fields in Salesforce, there is the need to change the field's type as the type of data that is to be stored needs to be changed. The reason for this change of data type could be because the initial requirements were not clear or because new discoveries about how the solution is used identify a more suitable field to be used.
Before attempting to change the data type of a field, you should carefully consider the effect that the change might have on the existing data and the impacts in general that may be experienced after the field's type has been changed. There are some situations and types of fields that are fully restricted and changing the data type of the field is not permitted.
There are some situations and types of fields where changes are permitted but have restrictions and have impacts on the stored data. These include the loss of data or system controls for what...