How to find details based on SAP error message number?
You can see the SAP error message details through SAP transaction code: SE91
In SAP FI Module, you can control the SAP error message number through SAP transaction code: OBA5
Normally SAP message numbers are issued like AA165
First two digits (alpha) is called application area next digits are called message number
Sometimes, you may not be able to see the SAP messages in SAP transaction code: OBA5, in such case you need to go to OBMSG transaction code and include the message number to your application area, then you need to come to back to OBA5 to make it information / warning / switch off / error (as the case may be).