I would like to check on txn SPAU, whereby the systems highlight the differences of program codes found in SAP4.7(6.2) and ECC5.0(6.4). I would like to know the usage of this txn SPAU and how it can facilitate one to retrieve the program codes (in version 6.2). I have a case which shows traffic light green but not able to retrieve and activate the program which is in version 6.2. It says changes not allow, unless you do a comparison of objects. Any idea what is this about?
Does it mean that for upgrade, one has to manually make changes add in program codes previously exist in old version into the new version 6.4?