Stock value and quantity unrealistic: & / &

What causes this issue?

When a goods movement or an incoming invoice is entered in the system,
the system simulates an update of the valuation data in the material
master record. The result of the simulation is unrealistic with respect
of the following:
Examples:
stock quantity becomes zero, whereas the stock value does not
negative stock value for a positive stock quantity
positive stock value for a negative stock quantity
negative stock value for a positive sales value
positive stock value for a negative sales value
This error can only occur in conjunction with materials with moving
average price valuation.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You cannot post this item. Terminate current processing.
Display the material master record (Accounting data).
Check the price, stock value, and stock quantity (also in the previous
month, if required).
<DS:TRAN.MM03>Proceed</>
Display both the material and the accounting documents for the material
and check whether the stock value and the stock quantity are realistic.
Material documents <DS:TRAN.MB51>Proceed</>
Accounting documents <DS:TRAN.MR51>Proceed</>
If there are discrepancies between the stock value and the stock
quantity on the one hand and the goods movements on the other, data
inconsistencies may exist.
INCLUDE MB_NA_HOTLINE
If you are sure that this situation resulted from business
transactions, there are still two ways of entering the goods movement.
Increase stock coverage:
Use movement type 561 to post an initial entry of stock balances.
Post the goods movement.
After having posted the movement, cancel the initial entry of stock
balances using movement type 562.
The disadvantage of this procedure is that the difference value is
posted to the account for initial entry of stock balances.
Debit/credit material
Use the function "Debit/credit material" (contained in Valuation menu)
to post a correspondingly high material debit (if value is negative) or
material credit (if value is positive) for the material. Then carry out
the goods movement. When you use this procedure, the system creates a
revaluation document.

Error message extract from SAP system. Copyright SAP SE.