Reminder letters are sent to parties who have to issue declaration forms to us.
Go to Gateway of Tally > Display > Statutory Reports > CST > Form Receivable
Select the Party’s ledger from List of Ledgers
In the Forms Receivable screen, press Alt + P (Print)
In the Print Report screen,
Print Reminder Letter?: Set it to Yes
Date of Issue: Enter the date of issue to capture the same in Dated field of Reminder Letter
Authorised Person: The name entered in Authorised Person field of Company VAT Details screen (F3: Statutory & Taxation features) appears here.

Press Enter to preview the print

Explanation on information captured in Reminder Letter is given below:
Date: The voucher date is captured here.
Vch No.: The voucher number appears here.
Assessable Value: The assessable value of sales entry appears here.
CST Amount: The CST on interstate sales entered in the invoice gets captured here.
Invoice Amount: The invoice value (assessable value + CST) appears here.
Form Type: Based on the Form Type selected for printing reminder letter in the Forms Receivable report, the Form Type gets captured here.
Covering Letter is sent for the Forms that we need to issue. It will have the details of the Invoices for which corresponding declaration forms are enclosed.
Go to Gateway of Tally > Display > Statutory Reports > CST > Form Issuable
Select the Party’s ledger from List of Ledgers
In the Forms Issuable screen, press Alt + P (Print)
In the Print Report screen,
Set Print as per Effective Date to Yes and specify the From and To period
Set Print Covering Letter to Yes
The date entered in Date of Issue field gets captured in the Dated field of Covering Letter.

Press Enter to view the preview

Explanation on information captured in Covering Letter is given below:
Date: The voucher date is captured here.
Vch No.: The Supplier Invoice number or the reference number appears here.
Effective Date: The Supplier Invoice date appears here if the same is mentioned in the invoice. In the absence of supplier invoice date, the effective date gets captured. If supplier invoice date and effective date are not entered in the invoice, the voucher date will be captured.
Assessable Value: The assessable value of purchase entry appears here.
CST Amount: The CST on interstate purchases entered in the invoice gets captured here.
Invoice Amount: The invoice value (assessable value + CST) appears here.
Form Type: Based on the Form Type selected for printing covering letter in the Forms Issuable report, the Form Type gets captured here.
Series Number: The Form Series Number entered in the invoice appears here.
Form No.: The Form number entered in the invoice appears here.
Issue Date: The Date of the declaration form entered in the invoice appears here.