ASSIGN FIELDSET to another FIELDSET
Assigning FIELDSET to another FIELDSET clears the content of the destination FIELDSET before copying all fields from the source FIELDSET.
ASSIGN DestinationFieldSet := SourceFieldSet
Assigning FIELDSET to another FIELDSET clears the content of the destination FIELDSET before copying all fields from the source FIELDSET.
ASSIGN DestinationFieldSet := SourceFieldSet