Alter Ledger Name of selected Vouchers

How can we change the ledger name of the selected vouchers in DayBook.

I've tried using this code but can't understand how to make this code to meet my requirement.

Code:

;; Sri Ganeshji : Sri Balaji : Sri Pitreshwarji : Sri Durgaji : Sri Venkateshwara
[#Form    : NRM Ledger Outstandings]
    Add    : Button    : Modify Parent
[#Form    : DayBook]
    Add    : Button    : Modify Parent
[#Report    : DayBook]
    Variable: SV Parent Name
[Button    : Modify Parent]
    Key         : Alt+F4
    Title       : $$LocaleString:"Change Parent"
    Action List : Accept Parent Name,Save Parent
    Mode        : Display
    Scope       : Selected
    [Button    : Accept Parent Name]
        Key    : Alt+F4
        Action : Alter        : Accept Parent Name
        Mode   : Display
    [Key    :  Save Parent]
        Key    : Alt+F4
        Action    : Modify Object    : Narration    :  ##SVParentName
        Mode    : Display
        Scope    : Current
[Report    : Accept Parent Name]    ;;Auto Report
    Auto        : Yes
    Title        : $$LocaleString:"Remarks"
    Form        : Accept Parent Name
[Form    : Accept Parent Name]
    Background      : @@SV_REPSTAT
    Parts          : Accept Parent Name
    Space Bottom    : 1
    Full Width      : No
    Full Height    : No
    Horizontal Align: Centre
    Vertical Align  : Centre
    Option            : Small Size Form
    Space Top        : 1
    [Part    : Accept Parent Name]
        Line            : Accept Parent Name
        [Line    : Accept Parent Name]
            Field        : Simple Prompt
            Right Field    : Name Field
            Local        : Field : Simple Prompt        : Set as    : "Remarks :"
            Local        : Field : Name Field        : Lines        : 2
            Local        : Field : Name Field        : Max        : 600
            Local        : Field : Name Field        : SetAs        : $VoucherNumber
            Local        : Field : Name Field        : Variable    : SVParentName
            Local        : Field : Name Field        : Modifies    : SVParentName
            Local        : Field : Name Field        : Show Table: Always
            Space Top    : 1
[Variable    : SV Parent Name]
    Type    : String

 

I think you need to change the following
Action : Modify Object : Narration : ##SVParentName

to the field that you desire to change

maybe the experts should be able to help on this

 

Yes I understood. But I don't understand what I should write instead of "Action : Modify Object : Narration : ##SVParentName" to change the ledger name instead of LedgerName. I've tried using following, but I unable to get the desired outpur.
LedgerName, Ledger, Ledger Name, Consignee

Dear Admin please help me to sort out this issue.

 

This should change the buyer name
Action : Modify Object : Party Name : ##SVParentName