Display collection of Vouchers with VchNum, InvNum, Party-BillRef

Dear Experts,
I want to create and export a simple purchase vouchers report by custom period to display Party LedgerName, Voucher Date and following fields :-
1) Voucher Number (see red box in attached screenshot)
2) Supplier Invoice No. (see green box in screenshot) and Invoice Date
3) Bill Reference (blue box in screenshot) --bill reference are manually changed in many vouchers.

Also, I am unable to retrieve the Supplier GSTIN from the voucher entry (NOT from Ledger Master).

But below code is Not working. Please help.

Code:

[#Menu : Gateway of Tally]
Add : Item : My Pur and DrN Report : Display : MyReport

[Report: MyReport]
Form: MyForm

[Form : MyForm]
Parts : MyPart

[Part : MyPart]
Line : MyTitle, MyLine
Repeat : MyLine :MyPurVoucher

[Line : MyTitle]
Use : MyLine
Local : Field : MyLedName : Set As : “Party Name”
Local : Field : MyVchType : Set As : "Voucher Type"
Local : Field : MyDate : Set As : ”Voucher Date”
Local : Field : MyVchNo : Set As : ”Voucher No.”
Local : Field : MySuppInvNo : Set As : ”Supp Inv No.”
Local : Field : MyBillRef : Set As : ”Billwise Reference”
Local : Field : PartyGSTIN : Set As : ”Supplier GST No.”
Local : Field : Default : Type : String

[Line : MyLine]
Field : MyLedName, MyVchType, MyDate, MyVchNo, MySuppInvNo, MyBillRef, PartyGSTIN

[Field :MyLedName]
Use : Name Field
Set As :$PartyLedgerName
Width : 65

[Field :MyVchType]
Use : Name Field
Set As :$VoucherTypeName

[Field : MyDate]
Use : Uni Date Field
Set As :$ReferenceDate    ;;- is this correct?

[Field : MyVchNo]
Use :  Name Field
Set As :$VoucherNumber    ;;- is this correct?

[Field : MySuppInvNo]
Use :  Name Field
Set As :$ReferenceNumber    ;;- is this correct?

[Field : MyBillRef]
Use :  Name Field
Set As :$$Table:VCHBILLName      ;;- is this correct?

;Need to fetch Supplier GST No. updated in the voucher and NOT from supplier Ledger Master
[Field : MyPartyGSTIN]
Use :  Name Field
Set As :$EI BuyerGSTIN          ;;- is this correct?


; Below code was posted by Amit Sir
[Collection: MyPurVoucher]
Type : Vouchers
Fetch : Date,VoucherTypeName,Vouchernumber,PartyLedgerName,Amount,BuyerGSTIN   ;;- is this correct?
Filter : Myfilter
Sort : Default : $LedgerName, $Date
Parm Var: SvFromDate:Date:"01-04-19"
Parm Var: SvToDate:Date:"31-03-20"

[system : formula]
Myfilter : $$IsPurchase:$VoucherTypeName or $$IsDebitNote:$VoucherTypeName

 

Amit Sir, thank you, that was really helpful. That is exactly what I was trying to generate.
Your suggestions will help me figure what I did wrong.

Yes, I saw the use of param var in some other code and I added it to the collections.

 

Right sir, I need to squeeze out more time so I can study TDL better.