fgl_list_clear() clears combobox items from a list in accordance with the index value associated with each value for the named field.
This function takes three arguments: field_name, start_index, and end_index. field_name is expressed as a CHAR datatype while the index arguments are both INTEGER.
fgl_list_clear() clears items from the list associated with the named field, from start_index to end_index and will return a ‘1’ if successful and a ‘0’ in the case of a failure.