GR & GR cancellation value is differing with exchange rate

Question

Hi experts,
Here a challenging issue.  I was  raised a  Thirdparty PO and I did GR(a special case) and  I did IR also
Due to some reasons  I have to cancel the IR the below are the differences
                                         for 64 pieces value is 21,339.97 CAD
and if i reverse(credit memo)for same qty valule is 21,592.29 CAD ok
now i am going to  GR  DOC  for 100 qty   value is  38,347.89 CAD
for the same  reversal                              value is  33,946.63-  why these differences is coming any one can have the idea? My vendor currency is  EUR   and Co code currency is  CAD.  I Went  through OB08
also but there is no use. U please suggest me any config things i was left.
Thanks
SR

Answer 1

The system behaviour you are describing is the correct one. Please,
kindly consider the information contained under the attached note:
191927 - Posting logic: GR for foreign currency PO.
As stated in it:
Postings to the material stock account (BSX):
In order to be able to determine the value of the stock posting, the
valuation methods which exist in the material master in local currency
(standard price, total value of stock) must be converted into document
currency. This translation is thus carried out on the posting date with
the exchange rate type that is assigned to the FI document type used,
that is, independent from the exchange rate defined in the purchase
order!
If no exchange rate type is assigned to an FI document type, the system
uses exchange rate type M.
Please, check in your system the settings stored in the customizing
transaction OBF4 for the document type WE (Goods receipt). If the field
'Exch.Rate Type for foreign currency documents' is empty, the exchange
rate type M is used.
The fixed conversion rate in the purchase order refers to the valuation
approach in the purchase order and, therefore, to the costs for the
purchased material. Therefore, the posting amount to the GR/IR clearing
account (WRX) is converted according to the fixed conversion rate in the
purchase order header.
On the other side the fixed conversion rate in the purchase order is not
designed for converting the posting values to the material stock account
(BSX). This conversion reflects the situation of the valuation of the
material stock and is therefore designed to be independent of the
conversion rate defined in the purchase order. This is what note 191927
outlines.
Therefore, in the standard system behaviour, the cancellation does not
really recalculate the currency translation, but uses the Purchase
Order history instead:
.- If there was only one Goods Receipt, the WRX is supposed to be the
the same for 102 as it was for 101.
.- If there were several Goods Receipts with different exchange rate
values, then, the WRX for the 102 will be done with the average
value, just as the also attached note 49995 describes.
The currency translation for the stock value is done within the MM-IM
function pool MBGB (MB_CALCULATE_VALUES etc.). It is always done using
currency type M and the posting date. We never use another date or
rate there.
Hope the information help.