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What is the procedure for determining the amount of the transaction, in the case of the issuance of Letters of Credit?

Issuing Credit Note can sustain the reduction in value of transactions for discounts, rebates, partial or total cancellation by returning the goods.
The status of the transaction amount varies depending on whether or not the payment made by proof of payment before issuing the credit note. Here are some assumptions:

1) In this case, the deduction to the amount of the Loan Notes may be deducted from the retention corresponding to the same provider operations for which has not operated retention. Ie, S /. 3.6 (6% S/.60) may be deducted from the appropriate deductions made by other transactions (If in a subsequent operation, it issues an invoice from the same supplier for a total of S /. 800, retention would correspond would be S /. 48 - 3.6 = 44.4).

What is the procedure to deduce the amount of withholding credit notes related payment voucher which suffered and retention? The

Letters of Credit issued by transactions in respect of which the withholding was made will not lead to a modification of the amount withheld or a refund by the Withholding Agent, notwithstanding that the VAT withheld is deducted from monthly gross tax.

retention upon the amount of the Letters of Credit may be deducted from the retention operations corresponding to the same supplier, for which has not operated retention.
Example:

15/06/1902 Company
The SAC Margaritas merchandise purchased from your dealer for a price of S /. 1.700, and was terminated immediately.

25.06.2002 provider

The issues you a credit rating by S /. 1.700, for the annulment of the sale.
On the same date from the same supplier receives a bill for S/.4, 012 including VAT for the purchase of other goods. How much should you withhold?

Solution: For the bill
S /. 1.700 was applied to the retention of S /. 102 on the date of payment. The issuance of the Notice of Credit for cancellation of the operation does not lead to a refund of amounts withheld.
However, the company may deduct the S /. 102 held for the amount of the deduction from the bill of S /. 4.012. Retail Value 3.400
IGV Sales 612Precio 4.012
Retention: 6% x 4.012 = S /.
241 S /. 241 - S /. 102 (and retained) = S / 139