In a field that has a Copy/Calculate formula (or an Edit/Match formula) and is not in the data file, you must specify an Edit Data Type so that form can evaluate the formula correctly. If the field is in the data file or is a validate or lookup field, form gets the data type from the data file's dictionary. The Edit Data Type field can contain any of the standard C/Base data types
Table 6-1: Edit Data Types
boolean integer real
character long short
date money string
time