NI Error Information 
If an error occurs or is detected by a node between the client and final destination, an error info packet is sent to the client. A 9-byte eye catcher characterizes this error information; the data is basically an ASCII string.
The data structure is formatted as follows:
Offset |
Size |
Description and Value |
|---|---|---|
0x00 |
9 |
eye catcher ("NI_RTERR\0") |
0x09 |
1 |
NI version (current version: 36) |
0x0a |
1 |
operation code (error information: 0; other messages > 0) |
0x0b |
1 |
currently unused filed |
0x0c |
4 |
return code (integer value in net byte order) |
0x10 |
4 |
error information text length (integer value in net byte order) |
0x04 |
* |
error information text in ASCII |
A user will be notified by the client (e.g. SAP GUI) that an error occurred, the SAProuter just forwards the packet.