If the quantity shown on the Acc M line in PO History is negative (-), it means the system removed the accounting effect of excess invoice quantity and added money to the stock account as a correction.As long as there was already quantity on hand in the stock account, this affects the moving average price, and always makes it higher.

It cannot correct differences between a GR and an invoice when the higher quantity is correct, and therefore should never be used when that is the case.

Instead, simply post the additional GR or invoice necessary to match the higher (correct) quantity.

It then determines the dollar value of the correction by multiplying that price per item times the quantity difference that the correction is for (not the necessarily the entire quantity on that particular document).

The system makes a correction to the GR/IR account in that amount, and posts a corresponding, opposite correction to the stock account.

The direction of charge against the stock account depends on whether the correction was for excess GR quantity or excess invoice quantity.

The system depicts the results of MR11 by inserting a separate line or section in the PO History to show the correction.The system first determines which particular GR or invoice is the offending document (i.e., which one caused the higher quantity posting), and the quantity difference that the document created and now needs to be corrected.The system determines the price per item involved in that particular document.Even when the lower quantity is correct, a far better approach is to correct the underlying problem using reversals and re-postings rather than execution of MR11.Transaction MR11 is executed against any PO with any difference in quantity between the GR and invoice for a line item.The quantity difference is used only to determine the direction and dollar amount of correction needed on the accounting side as a result of that difference.