Field symbols in objects

Question

Hi Guys
I am using a field sym in the foll way and iam getting a dump.
ls_fcat = mod_fcat( ls_fcat ).
method mod_fcat.
   field-SYMBOLS: <l> like line of rt.
    LOOP AT rt ASSIGNING <l>.
      CASE <l>-fieldname.
        WHEN 'VALUE_CONTRACT_E'.
        CLEAR: <l>-ref_field,<l>-ref_table.
        <l>-coltext   = text-h01. <l>-SCRTEXT_L = text-h01.
        <l>-SCRTEXT_M = text-h02. <l>-SCRTEXT_S = text-h02.
        WHEN OTHERS.
      ENDCASE.
    ENDLOOP.
  ENDMETHOD.
endmethod.
When the control goes to clear it gives me a dump.I dont understand why coz iam already assignin <l> at every loop pass.
Please help!!
Thanks

Answer 1

Hi Guys
This is the error i get
A new value is to be assigned to the field "<L>", 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).
Thanks