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Customer-Specific Message
Parameters 
You use customer-specific message parameters to control messages differently.

Application examples for customer-specific message parameters are:
The display of a message should be limited to a particular request category (for example, only processors should see the message).
By classifying errors (minor error – major error) you cause a different message to be issued depending on the severity of the error.
If you want to enhance the message structure with the customer-specific message parameters, you can use parameter MESSAGE_PARAMETER of category STRING to do this.
The following sample source text comes from sample request SAP_DEMO01 view S01_2
clear ls_message.
ls_message-type = 'W'.
ls_message-id = 'CRM_SRV_WEBREQ_EXMPL'.
ls_message-number = '006'.
ls_message-field = '//request/car/length'.
ls_message-message_parameter = 'S01_2'.
append ls_message to et_message.