Problem with table MBEWH

Hello SAP experts , im having a little problem with table MBEWH because the data i whant to extract isnt the correct one, i saw that this table stores all the prices for the materials and it groups them by year and by month but when i check to see what was the price for a specific material the price i had on that time periord inst the same as the one on the system, also i manage my material with baches and when i check to see if that batch was in that period of time it isnt so im really confused as to how the system saves the historical data on this table, thank you in advanced.

kind regards