help need to get previous Voucher number

Experts...

I need to get last Entered Sales Voucher Number (Voucher Numbering set as Manual)
Code is below... Please Guide me...

;;Voucher Number in Sales Invoice

[#Part: VCHTitle2Left]
Add:Line:After:VCH RefVCHNum
[Line: PVCHNum]
Invisible: Not (@@IsSales)
Set As : $VCHnumber
Fields : Medium Prompt, Invoice VCHNum
Local: Field: Medium Prompt : Set as : "Last VCH Number : "

[Field: Invoice VCHNum]
Use : Name Field
Width : 15
Set As : $VCHnumber
Storage : Sale VCHNum
Skip : Yes

[System: UDF]
SaleVCHNum : String : 2003

 

Thank You So much sir ...... It is Perfect....