gd_layout-box_fieldname     = 'SEL'로하고 더블클릭 이나 back을 누르면 에러가 나는데...

왜그럴까요? 뭘 잘못 한지 모르겠네요. 'SEL'옵션을 넣지 않으면 어떤 이벤트도 잘 됩니다.

답변 부탁드립니다.

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Runtime Errors         MOVE_TO_LIT_NOTALLOWED_NODATA

Short text
    Error at assignment: Overwritten protected field.

What happened?
    Error in the ABAP Application Program

    The current ABAP program "SAPLSLVC_FULLSCREEN" had to be terminated because it
     has
    come across a statement that unfortunately cannot be executed.

Error analysis
    A new value is to be assigned to the field "", although this field is
    entirely or partly protected against changes.

    The following are protected against changes:
    - Character literals or numeric literals
    - Constants (CONSTANTS)
    - Parameters of the category IMPORTING REFERENCE for functions and
    methods
    - Untyped field symbols not yet assigned a field using ASSIGN
    - TABLES parameters if the actual parameter is protected against changes
    - USING reference parameters and CHANGING parameters for FORMs, if the
    actual parameter is protected against changes and
    - Accesses using field symbols if the field assigned using ASSIGN is
    protected (or partially protected, e.g. key components of an internal
    table with the type SORTED or HASHED TABLE) against changes
    - Accesses using references, if the field bound to the reference is
    protected (or partially protected) against changes
    - External write accesses to READ-ONLY attributes,
    - Content of a shared object area instance accessed using a shared lock
    (ATTACH_FOR_READ).

* e-abap님에 의해서 게시물 이동되었습니다 (2010-07-07 23:42)