Message AA416 Retirement of old assets data not possible (No existing old assets data)
Check : Are you using Group Assets ? If yes,
Check the values on your group asset consistent in relation to the assigned individual assets. With other words if your assigned individual asset(s) have accumulated APC values the group asset should have accumulated APC values, too.
SAP strictly recommends to assign NOT to one group asset single assets with postive and negative accumalted APCs values. Negative and positive individual assets should then be managed separately on one group asset in each case.