In regards to the SWII IID, the Message Function 4 is for pre-arrival changes whereas the Message Function 52 is for post arrival, pre-release changes.
Message Function 4 (Change)
All non-key fields can be changed (key fields that cannot be changed are: Business Number, Transaction ID and SO)
Message Function 52 (Amend)
Amend
All non-key fields can be changed (key fields that cannot be changed are: Business Number, Transaction ID and SO)
Adjust
Business Number, Transaction Number
English 
Chinese (China) 
Chinese (Hong Kong) 
French 
German 
Italian 
Japanese 
Portuguese 
Romanian 
Slovak 
Spanish (Colombia) 
Spanish (Chile) 
Spanish (Ecuador) 
Spanish (Mexico) 