Sales Price Control TDL

help this Code only Blocks for single line sales Voucher. i need help to extend the control to apply on all voucher Lines
[#Field: VCH Rate]
Option: VCH Rate1: $$IsSales:##SVVoucherType
[!Field: VCH Rate1]
Control : Msg1$$IsEmpty:$$VchRate OR $MSG2)

[#Field: VCHBATCH Rate]
Option: VCHBATCH Rate1: $$IsSales:##SVVoucherType
[!Field: VCHBATCH Rate1]
Control: Msg1$$IsEmpty:$$VchRate OR $MSG2)

[System : Formula]
MSG1: "Low Price" + $$NewLine+""+ $$NewLine+" Please Enter Correct Rate !!!"

MSG2:$$VchRate:<= ($$Number:$LastPurcPrice:StockItem:$StockItemName /(1-0.0))

;5% Margin given if you need you can change the margin Percentage. If you Need 10%, if you Need 8%;

 

try, this is for Standardprice control work on multiple Stock Item In invoice


[#Field: VCH Batch Rate]
Add : Option : VCH Sales Batch Rate : @@IsSales

[!Field : VCH Sales Batch Rate]
Validate : ($$IsEmpty:$$Value OR $$Value >= $Standardprice:StockItem:$StockItemName)

[#Field: VCH Rate]
Add : Option : VCH Sales Rate : @@IsSales

[!Field : VCH Sales Rate]
Validate : ($$IsEmpty:$$Value OR $$Value >= $Standardprice:StockItem:$StockItemName)

 

How to make it work on multiple batch like
batch1 100nos@100
batch2 100nos@125
batch3 150nos@140

and i need to control from oldest batch ie batch1