A reserved word that is necessary when you are assigning values to fields that are stored in a document (as opposed to temporary fields). You can use FIELD to change the contents of an existing field or to create new fields.
You cannot use the FIELD reserved word within an @function. Use @SetField instead.
FIELD fieldName := value ;
In some cases, action formulas that don't evaluate to a result (for example, a button formula) return a "No Main or Selection expression in formula" error message. You can supply a value such as an empty string (""), or you could provide an expression at the end of the formula, as shown:
SELECT @All
This reserved word is most useful in agent, button, hotspot, and action formulas. It does not work in column, selection, hide-when, window title, or form formulas.
FIELD Company := Company + ", Inc.";
FIELD CompanyName := Company + ", Inc.";
FIELD CompanyName := @DeleteField;
FIELD fullname := @If(fullname = "";firstname + " " + lastname;fullname)
ReplaceItemValue method of LotusScript® NotesDocument class
replaceItemValue method of Java™ Document class