how to fetch voucher's total billed quantity

i just add a filed to purchase resgiter and want to fetch voucher total billed quantity but getting only first inventory value, please need help

Code:

[#Line : DSP VchAccDetail]
Add : Right Fields :before:dsp vchnumber: Qnts
[Field : Qnts]
background:yellow
Border      : Thin Left
Width       : 15
Align       : center
Use         : Qty Field
Storage     : Actual Qty : All Inventory Entries : first
Style       : Normal Bold
Invisible   : no
COLOR : BLUE
Format      : "Decimal:0"

 

thanks for the reply
but tell me how to use what provided by you

 

Actually i want to display vouchers billed qty in simple purchage register report