Bought Out materials Valuation doubts

Question

Dear All,
By mistake our POs were created for a price higher than the actual price (Excise duty Part added twice - once along with Purchase price then again using tax code). GRN was made for this higher price and while booking the bill (MIRO) the same was corrected by crediting the difference amount to Stock account (To the extent stock is available otherwise consumption will be credited).
However there is a huge time GAP between GRN and MIRO date and in the meantime lot of subsequent GRNs and Consumption posting has taken place at a value higher than actual.
now after making the MIRO correction will the costing for the material be corrected automatically (for stock as well as consumption that has taken place in the mean time)
if no then what is the impact of the stock credit given during MIRO entry.

Answer 1

In Case stock is available in system at the time of MIRO credit will be loaded on to stock, otherwise creit will be loaded into Price difference account in ratio stock qty available.
PO price is 110 for 100 pcs
At GR
Stock : 11000 Db
GR/IR: 11000Cr
At the Time of MIRO if stock is available (it is > or += 100) & Invoice is done at 100 for 100 pcs
Stock : 1000 Cr
GR/IR: 11000 Db
Vendor : 10000 Cr.
At the time of MIRO Stock available is 30 & Invoice is done at 100 for 100 pcs
Stock : 300 Cr
GR/IR: 11000 Db
Vendor : 10000 Cr.
PRD : 700 Cr.
Regards
Sanjay Kohli