Price change of & % in month &/& for material &

What causes this issue?

Due to action taken the quantity and value of the material &V4& are
changed. This leads to calculation of a new moving average price: The
new price deviates from the old one by &V1&.

How to fix this error?

Before you carry out the posting, you should determine the reason for
this difference.
You could check the material line items to find out which postings have
led to the current moving average price. If the action taken refers to a
purchase order, you could contact Purchasing to find out whether a
mistake was made when entering the order price.

Error message extract from SAP system. Copyright SAP SE.