I Need Help to Access The Source Code From A Form to Know the Calculation Formula

Question

Hi,
I Need Help to Access The Source Code From A Form to Know the Calculation Formula. The application is a windows form application that is linked to SQL Server 2008. In one of the application forms it generates an invoice and does some calculations. I just
need to know where behind that form is the code that's doing the calculations to generate the invoice, I just need to get into the formula that's doing these calculations.
Thank you so much.

Answer 1

Hi, 
Thanks for the reply. This is a view and [AmountDue] is supposed to be [CurrentDueAmount] + [PastDueAmount] - [PaidAmount]. The view is not calculating [PaidAmount] right . Below is the complete code of the view. Do you see anything wrong in the code ?
Thanks. 
SELECT     [isi].[InvoiceID], [ii].[DueDate], [SubInvoiceID] = [isi].[ID], [INV_FacilityID] = [if].[ID], [if].[FacilityID],
[iff].[FacilityFeeID], [LoanID] = NULL, [isi].[PortfolioID], [isi].[Portfolio], 
                      [PaymentType] = [isis_fee].[SectionType], [Name]
= [iff].[Name], [ReceivedAmount], [dates].[CurrentDueAmount], 
                      [PastDueAmount] = CASE WHEN ISNULL([ReceivedAmount],
0) > 0 THEN [pastdue].[PastDueFeeAmount] + ISNULL([ReceivedAmount], 0) 
                      WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply reset to current. */ CASE WHEN [pastdue].[PastDueFeeAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN 0 ELSE [pastdue].[PastDueFeeAmount]
+ ISNULL([ReceivedAmount], 0) END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [pastdue].[PastDueFeeAmount] < 0 THEN 0 ELSE
[pastdue].[PastDueFeeAmount] END, [PaidAmount] = CASE WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply rest to current. */ CASE WHEN [pastdue].[PastDueFeeAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN - ([pastdue].[PastDueFeeAmount]
+ ISNULL([ReceivedAmount], 0)) ELSE 0 END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [pastdue].[PastDueFeeAmount] < 0 THEN - [pastdue].[PastDueFeeAmount]
ELSE 0 END, [AmountDue] = [unpaid].[UnpaidFeeAmount], [ID] = [iff].[FacilityFeeID]
FROM         [dbo].[INV_SubInvoice] isi JOIN
                      [dbo].[INV_Invoice] ii ON [isi].[InvoiceID]
= [ii].[ID] JOIN
                      [dbo].[INV_Facility] [if] ON [isi].[ID] = [if].[SubInvoiceID]
JOIN
                      [dbo].[INV_FacilityFee] iff ON [if].[ID] = [iff].[INV_FacilityID]
JOIN
                          (SELECT     [sis_fee].[ID],
[sis_fee].[SectionTypeCode], [SectionType] = [st_fee].[Name], [sis_fee].[INV_FacilityFeeID]
                            FROM      
   [dbo].[INV_SubInvoiceSection] sis_fee JOIN
               [dbo].[INV_SectionType] st_fee ON [sis_fee].[SectionTypeCode] = [st_fee].[Code]
                            WHERE      [INV_FacilityFeeID]
IS NOT NULL AND [StatusCode] = 'BILL') isis_fee ON [iff].[ID] = [isis_fee].[INV_FacilityFeeID] JOIN
                          (SELECT     [iffa].[SectionID],
[AccrualDeterminationDateMax] = MAX([iffa].[AccrualDeterminationDate]), 
               [AccrualDeterminationDateMin] = MIN([iffa].[AccrualDeterminationDate]), [CurrentDueAmount] = SUM([iffa].[AccruedFeeAmount]), 
               [ReceivedAmount] = SUM([iffa].[ReceivedFeeAmount])
                            FROM      
   [dbo].[INV_FacilityFeeAccrual] iffa
                            GROUP BY [iffa].[SectionID])
dates ON [isis_fee].[ID] = [dates].[SectionID] LEFT JOIN
                          (SELECT     *
                            FROM      
   [dbo].[INV_FacilityFeeAccrual]) unpaid ON [dates].[SectionID] = [unpaid].[SectionID] AND 
                      [dates].[AccrualDeterminationDateMax] = [unpaid].[AccrualDeterminationDate]
LEFT JOIN
                          (SELECT     [SectionID],
[PastDueFeeAmount] = SUM([PastDueFeeAmount])
                            FROM      
   [dbo].[INV_FacilityFeeAccrual]
                            GROUP BY [SectionID]) pastdue
ON [dates].[SectionID] = [pastdue].[SectionID]
UNION
SELECT     [isi].[InvoiceID], [ii].[DueDate], [SubInvoiceID] = [isi].[ID], [INV_FacilityID] = [if].[ID], [if].[FacilityID],
[FacilityFeeID] = NULL, [il].[LoanID], [isi].[PortfolioID], [isi].[Portfolio], 
                      [PaymentType] = [isis_loan].[SectionType], [Name]
= [il].[Name], [ReceivedAmount], [CurrentDueAmount], [PastDueAmount] = CASE WHEN ISNULL([ReceivedAmount], 
                      0) > 0 THEN [PastDueAmount] + ISNULL([ReceivedAmount],
0) WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply rest to current. */ CASE WHEN [PastDueAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN 0 ELSE [PastDueAmount] + ISNULL([ReceivedAmount],
0) END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [PastDueAmount] < 0 THEN 0 ELSE [PastDueAmount]
END, 
                      [PaidAmount] = CASE WHEN [isis_loan].[SectionTypeCode]
= 'LOAN_PRIN' THEN 0 ELSE CASE WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply rest to current. */ CASE WHEN [PastDueAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN - ([PastDueAmount] + ISNULL([ReceivedAmount],
0)) ELSE 0 END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [PastDueAmount] < 0 THEN - [PastDueAmount]
ELSE 0 END END, 
                      [AmountDue] = CASE WHEN [isis_loan].[SectionTypeCode]
= 'LOAN_PRIN' THEN [CurrentDueAmount] ELSE [unpaid].[AmountDue] END, [ID] = [il].[LoanID]
FROM         [dbo].[INV_SubInvoice] isi JOIN
                      [dbo].[INV_Invoice] ii ON [isi].[InvoiceID]
= [ii].[ID] JOIN
                      [dbo].[INV_Facility] [if] ON [isi].[ID] = [if].[SubInvoiceID]
JOIN
                      [dbo].[INV_Loan] il ON [if].[ID] = [il].[INV_FacilityID]
JOIN
                          (SELECT     [sis_loan].[ID],
[sis_loan].[SectionTypeCode], [SectionType] = [st_loan].[Name], [sis_loan].[INV_LoanID]
                            FROM      
   [dbo].[INV_SubInvoiceSection] sis_loan JOIN
               [dbo].[INV_SectionType] st_loan ON [sis_loan].[SectionTypeCode] = [st_loan].[Code]
                            WHERE      [INV_LoanID]
IS NOT NULL AND [StatusCode] = 'BILL') isis_loan ON [il].[ID] = [isis_loan].[INV_LoanID] JOIN
                          (SELECT     [iffa].[SectionID],
[AccrualDeterminationDateMax] = MAX([iffa].[AccrualDeterminationDate]), 
               [AccrualDeterminationDateMin] = MIN([iffa].[AccrualDeterminationDate]), [CurrentDueAmount] = SUM([iffa].[ExpectedPrincipalAmount]), 
               [ReceivedAmount] = SUM([ReceivedPrincipalAmount])
                            FROM      
   [dbo].[INV_LoanPrincipalAmortization] iffa
                            GROUP BY [iffa].[SectionID]
                            UNION
                            SELECT     [iffa].[SectionID],
[AccrualDeterminationDateMax] = MAX([iffa].[AccrualDeterminationDate]), 
              [AccrualDeterminationDateMin] = MIN([iffa].[AccrualDeterminationDate]), [CurrentDueAmount] = SUM([iffa].[AccruedInterestAmount]), 
              [ReceivedAmount] = SUM([ReceivedInterestAmount])
                            FROM      
  [dbo].[INV_LoanCashInterestAccrual] iffa
                            GROUP BY [iffa].[SectionID]
                            UNION
                            SELECT     [iffa].[SectionID],
[AccrualDeterminationDateMax] = MAX([iffa].[AccrualDeterminationDate]), 
              [AccrualDeterminationDateMin] = MIN([iffa].[AccrualDeterminationDate]), [CurrentDueAmount] = SUM([iffa].[AccruedInterestAmount]), 
              [ReceivedAmount] = SUM([ReceivedInterestAmount])
                            FROM      
  [dbo].[INV_LoanPIKInterestAccrual] iffa
                            GROUP BY [iffa].[SectionID])
dates ON [isis_loan].[ID] = [dates].[SectionID] LEFT JOIN
                          (SELECT     [AmountDue]
= [UnpaidPrincipalAmount], [SectionID], [AccrualDeterminationDate]
                            FROM      
   [dbo].[INV_LoanPrincipalAmortization]
                            UNION
                            SELECT     [AmountDue]
= [UnpaidInterestAmount], [SectionID], [AccrualDeterminationDate]
                            FROM      
  [dbo].[INV_LoanCashInterestAccrual]
                            UNION
                            SELECT     [AmountDue]
= [UnpaidInterestAmount], [SectionID], [AccrualDeterminationDate]
                            FROM      
  [dbo].[INV_LoanPIKInterestAccrual]) unpaid ON [dates].[SectionID] = [unpaid].[SectionID] AND 
                      [dates].[AccrualDeterminationDateMax] = [unpaid].[AccrualDeterminationDate]
LEFT JOIN
                          (SELECT     [PastDueAmount]
= SUM([PastDuePrincipalAmount]), [SectionID]
                            FROM      
   [dbo].[INV_LoanPrincipalAmortization]
                            GROUP BY [SectionID]
                            UNION
                            SELECT     [PastDueAmount]
= SUM([PastDueInterestAmount]), [SectionID]
                            FROM      
  [dbo].[INV_LoanCashInterestAccrual]
                            GROUP BY [SectionID]
                            UNION
                            SELECT     [PastDueAmount]
= SUM([PastDueInterestAmount]), [SectionID]
                            FROM      
  [dbo].[INV_LoanPIKInterestAccrual]
                            GROUP BY [SectionID]) pastdue
ON [dates].[SectionID] = [pastdue].[SectionID]
UNION
SELECT     [isi].[InvoiceID], [ii].[DueDate], [SubInvoiceID] = [isi].[ID], [INV_FacilityID] = [if].[ID], [if].[FacilityID],
[FacilityFeeID] = NULL, [il].[LoanID], [isi].[PortfolioID], [isi].[Portfolio], 
                      [PaymentType] = 'PIK Interest Applied', [Name]
= [il].[Name], [ReceivedAmount], [CurrentDueAmount] = - [dates].[CurrentDueAmount], 
                      [PastDueAmount] = - CASE WHEN ISNULL([ReceivedAmount],
0) > 0 THEN [PastDueAmount] + ISNULL([ReceivedAmount], 0) WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply rest to current. */ CASE WHEN [PastDueAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN 0 ELSE [PastDueAmount] + ISNULL([ReceivedAmount],
0) END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [PastDueAmount] < 0 THEN 0 ELSE [PastDueAmount]
END, [PaidAmount] = - CASE WHEN ISNULL([ReceivedAmount], 0) 
                      < 0 THEN /* We bring past due to zero and
apply rest to current. */ CASE WHEN [PastDueAmount] + ISNULL([ReceivedAmount], 0) 
                      < 0 THEN - ([PastDueAmount] + ISNULL([ReceivedAmount],
0)) ELSE 0 END WHEN ISNULL([ReceivedAmount], 0) = 0 AND 
                      [PastDueAmount] < 0 THEN - [PastDueAmount]
ELSE 0 END, [AmountDue] = - [AmountDue], [ID] = [il].[LoanID]
FROM         [dbo].[INV_SubInvoice] isi JOIN
                      [dbo].[INV_Invoice] ii ON [isi].[InvoiceID]
= [ii].[ID] JOIN
                      [dbo].[INV_Facility] [if] ON [isi].[ID] = [if].[SubInvoiceID]
JOIN
                      [dbo].[INV_Loan] il ON [if].[ID] = [il].[INV_FacilityID]
JOIN
                          (SELECT     [sis_loan].[ID],
[sis_loan].[SectionTypeCode], [SectionType] = [st_loan].[Name], [sis_loan].[INV_LoanID]
                            FROM      
   [dbo].[INV_SubInvoiceSection] sis_loan JOIN
               [dbo].[INV_SectionType] st_loan ON [sis_loan].[SectionTypeCode] = [st_loan].[Code]
                            WHERE      [INV_LoanID]
IS NOT NULL AND [StatusCode] = 'BILL' AND [sis_loan].[SectionTypeCode] = 'LOAN_INT_PIK') isis_loan ON 
                      [il].[ID] = [isis_loan].[INV_LoanID] JOIN
                          (SELECT     [iffa].[SectionID],
[AccrualDeterminationDateMax] = MAX([iffa].[AccrualDeterminationDate]), 
               [AccrualDeterminationDateMin] = MIN([iffa].[AccrualDeterminationDate]), [CurrentDueAmount] = SUM([iffa].[AccruedInterestAmount]), 
               [ReceivedAmount] = SUM([ReceivedInterestAmount])
                            FROM      
   [dbo].[INV_LoanPIKInterestAccrual] iffa
                            GROUP BY [iffa].[SectionID])
dates ON [isis_loan].[ID] = [dates].[SectionID] LEFT JOIN
                          (SELECT     [AmountDue]
= [UnpaidInterestAmount], [SectionID], [AccrualDeterminationDate]
                            FROM      
   [dbo].[INV_LoanPIKInterestAccrual]) unpaid ON [dates].[SectionID] = [unpaid].[SectionID] AND 
                      [dates].[AccrualDeterminationDateMax] = [unpaid].[AccrualDeterminationDate]
LEFT JOIN
                          (SELECT     [PastDueAmount]
= SUM([PastDueInterestAmount]), [SectionID]
                            FROM      
   [dbo].[INV_LoanPIKInterestAccrual]
                            GROUP BY [SectionID]) pastdue
ON [dates].[SectionID] = [pastdue].[SectionID]