APPEND - ASSIGNING ???

Hello all

In a weblog by Brian McKellar i found this:

FIELD-SYMBOLS: LIKE LINE OF p_column_definitions.

• First column is small icon.

APPEND INITIAL LINE TO p_column_definitions ASSIGNING -TITLE = ' '.

I have never seen this APPEND syntax before.

I have also tried to find it documented on help.sap.com - no luck.

Can anyone explain this syntax and show me where SAP has documentede it ?

Best regards

Thomas Madsen Nielsen