1. Data can be lost when converting from Picklist (Single-Select) to Picklist (Multi-Select). B. Data can be lost when converting from Auto-Number to text. C. Data can be lost when converting from Number to Currency (assuming that field lengths are identical) D. Information can be lost when converting from text area (rich) To text area (long)
Changing to Picklist (Multi-Select) from any other type
Currently, defined picklist values are retained when you change a picklist to a multi-select picklist. If records contain values that are not in the picklist definition, those values will be deleted from those records when the data type changes.