Tracer 
This action is used to help debug a transaction. When you execute a transaction from the SAP Manufacturing Integration and Intelligence (SAP MII )Workbench, a trace log that lists step-by-step information is written. You can use the Tracer action to add additional information to the text display, and it can be inserted anywhere in your transaction. To move data to the trace log at runtime, map a specific value or expression into the Message property.
Features
The properties for this action are listed in the following table:
Property |
Data Type |
Access |
Use |
Level |
String |
In |
Indicates the type of data that is in the trace log. |
Message |
String |
In and out |
Contains the string that is in the trace log. |
Success |
Boolean |
Out |
Indicates whether the action succeeded or failed. If it failed, errors are displayed in the server trace log. |