An error occurs when trying to exit from ALV report

Question

Hi,
I have a report which imports and display in ALV data from an excel file. Unfortunately when I'm trying to exit I receive an error as I copied below.
Runtime Errors         MOVE_TO_LIT_NOTALLOWED_NODATA
Date and Time          17.10.2008 08:39:18
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 "<L_BOX>", 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).
Trigger Location of Runtime Error
     Program                                 SAPLSLVC_FULLSCREEN
     Include                                 LSLVC_FULLSCREENF02
     Row                                     686
     Module type                             (FORM)
     Module Name                             MARKS_SAVE
How can I solve the problem ?
Thanks
Stefan

Answer 1

Hi ,
  Please check the GUI status you are using for the ALV.
Looking at the code what i feel is that the error occurs when the user action is the code &SAL' or '&ALL'.
Please put a break point at the statement and see why is the error occurring
Regards,
Arun