Some urgent issues

Question

Hai I have issues on the following:-
1) The PVC materials in the Supplier's Invoice differs from our P.O rate, Price list for those materials is recd by our Pur.Dept from the supplier and then it is  recd by accts dept and the rate in the Invoice is checked with the rate in the price list and if found correct, The RATE is MANUALLY entered while accounting the Invoice.Hw in SAP?
2) If there is any special excise duty in the Invoice(at the time of imports in procurement) it is entered Manually.
3) For the Excisable Invoices If Cenvat Credit not taken,the system showsa message" CREDIT NOT TAKEN".Is this done? hw?I think so some validation is created for capturing excise invoices.Means at the time of MIGO if excise invoice is not captured thne system should prompt the user that excie invoice not captured"CENVAt Not Taken".
4)Suppose there is a price variation in po and invoicewhat we have to do?for the materials like copper and other materials which have variation in prices day to day?Hw to tackle this scenario at the time of MM integration.
Regards
Raghavendra.M
SAP-Practice

Answer 1

SAP maintains inforecord (ME13) with reference to the supplier and the material. When a new PO is created, the rates automatically flow from the inforecord. If the rates are revised in the PO, the same gets reflected back in  the inforecord.
Now when the invoice is recieved from the supplier it is recorded through invoice verification process. At that time if the invoice amout variance is beyond the set tolerance limit, you can still account the invoice, but the invoice gets blocked for payment. This needs appropriate release procedure to be followed subsequently.
Whatever is recoreded in SAP needs to be appropriately supported by a physical document.  If the rates are high, a debit memo may be raised on the supplier, who in turn when accepted gives a credit memo.