Regarding message AA478

Question

Dear colleagues,
What is the significance of message AA478 (Posting transaction is not possible (value date not allowed))? We have option to set this message as warning instead of error but what would be consequence. 
We procure assets through purchase orders and transfer them to our distributors for free of charge. An asset could have several transactions such as we send it to a distributor and the distributor sends it to another distributor and so on.
I have an asset which has had GR on 10.02.2011, with transaction type 120, and transferred to a distributor on 19.02.2011, with transaction type 320, when user tries to post MIGO on 15.02.2011 system shows message AA478 as error.
I have found below explanation on SAP help; [http://bit.ly/h6ph6N]
Be careful when you have an asset with several transactions, and you want to reverse a transaction that is chronologically immediately after a negative transaction. In this case, you may have to reverse the negative transaction as well, since the net book value of the asset could become negative after the first reversal
Metin

Answer 1

Hi Metin,
As per SAP note 533378, the error AA478 will be raised as the system does not allow the transaction with this asset value date because the proportional asset retirement values would not be correct  anymore.                                                                               
In order to post the transaction, the retirement must be  reversed first or the new transaction must be posted with another asset value date.                                                                               
Alternatively, you can make message AA478 as a warning message. Please  refer to SAP Note 533378 which states the following:                                                                               
With the attached modification report error message AA478 can be           
made customizable. The error message can be changed into a warning         
message or information message so that a transaction with such an asset    
value date can finally be posted. In this case it must be ensured by       
customer-specific tests that the asset values are calculated correctly     
by the system! SAP recommends, to limit these postings to a few            
individual users in the message customizing in order to avoid incorrect    
postings.                                                                  
The report ZAABGAMES in SAP Note 533378 can be used in ECC6.0. Also, you  do not need to implement note 533378 as the changes are already in  ECC6.0.   
regards Bernhard