Moving average price becomes negative

Question

Dear all,
I have read several threads about this subject but my scenario is a little bit different than the ones described so far:
1 - I had a GR of 12 Tons for 2000 u20AC for material A
2 - Product A had several production consumptions (movement 261) with the correct MAP
3 - My user has accidently posted the invoice for 2000 u20AC, but for a quantity of 12 Kg. This caused a change in the moving average price, causing the following consumptions (261) to be wrong. This posting was done in January (already closed) but only detected now, unfortunately.
4 - We have found the message when the user detected the mistake and tried to cancel the invoice.
As we have dozens of consumptions of this product and dozens of sales orders of the finished product (for which product A was a component), I was thinking of making a value change in MR21 for component A, so that the following consumptions would be correct. And correct the MAP of the finished products, so that the cost of sales is corrected from now on.
I would also forget about canceling the invoice.
Can you tell me if this is the correct approach recommended by SAP? Has any of you faced similar issues that has a better solution?
Thanks in advance,
JL

Answer 1

Option 1 : You have to cancel all the documents last come First to Nullify the effect.( Which I feel the best practice may be bit tedious). And do the postings as required.
Option 2 : Do Manipulate with Movement type 561, means just Put 1 kg or .1 kg with very high value to mitigate the MAV value.
Option 3 : You can go for MR21.