Investigate Log Content 
The Error Handling Changes Log report (transaction /AIF/EDCHANGES) of the SAP Application Interface Framework displays the changes made to the data messages of the selected interface(s) in the error handling transaction.
You can restrict the selection by namespace, interface name and version. You can refine the selection by inserting a date range or the message ID.
In the output screen, a tree view displays all selected interfaces. When a node is selected, the changes made to the messages are displayed.
The following information is shown for each message:
The GUID of the data message
The field path of the field that was changed by the user
The new and old value
Date and time of the modification
Transaction Application Log Display (/AIF/LOG) offers a specialized view of the transaction to analyze the application log (transaction SLG1). In the specialized view, the log object is predefined as /AIF/LOG, so that only application log messages created be the SAP Application Interface Framework are displayed.
The selection can be restricted further by:
Subobject – in the case of the SAP Application Interface Framework, this refers to the namespace and interface name
external number – is either the message GUID or a file number of the test tool
time period
creator
class
type
For more information, refer to the documentation of the application log.