SAP Message AA345 - Quantity-related retirement not possible in asset &

Diagnosis
In the posting year, asset acquisitions from previous years exist forthe asset &V1& &V2&. In the same or following years, however, newacquisitions have been posted. Therefore, an exact retirement amountcannot be calculated from the quantity entered.

System Response
Quantity related retirement is not allowed here.

Procedure
Calculate the retirement amount or percentage.