You need 3 separate insert statements e.g.
insert into AccountTran(YearId, CompanyId, TrType, TranId, DrAccountId, CrAccountId, DebitAmount, CreditAmount, Narration)
values
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @BookId, @PartyId, @NetAmount, 0.00,@Remarks),
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @PartyId, @BookId, 0.00, @NetAmount, @Remarks)
If @DiscountMainAmt <> 0
insert into AccountTran(YearId, CompanyId, TrType, TranId, DrAccountId, CrAccountId, DebitAmount, CreditAmount, Narration)
values
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @BookId, @Discount1AC,
@DiscountMainAmt, 0.00, @Remarks),
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @Discount1AC, @BookId, 0.00,
@DiscountMainAmt, @Remarks)
If @DiscountsubAmt <> 0
insert into AccountTran(YearId, CompanyId, TrType, TranId, DrAccountId, CrAccountId, DebitAmount, CreditAmount, Narration)
values
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @BookId,
@Discount1AC,@DiscountMainAmt, 0.00, @Remarks),
(@YearId, @CompanyId, 'PurchaseEntry', @PurchaseId, @Discount1AC, @BookId,
0.00,@DiscountMainAmt, @Remarks)
Note that I've removed the final comma from the first 2 statements and included the
insert into ...
line for the second 2 statements.
Note also that you are not using
@DiscountsubAmt
in that final insert statement - probably just a typing error.