WRF_AT_MESSAGES_DET is a standard SAP class available within R/3 SAP systems depending on your version and release level. Below is the standard documentation available for this class interface. You can view this information and more if you enter the class name WRF_AT_MESSAGES_DET into the relevant SAP transaction such as SE24 or SE80.
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Within the comments section below there is also an opportunity for you to add useful hints, tips and information specific to this SAP object. This means that you and other users will be able to find these details quickly by simply searching on the object name WRF_AT_MESSAGES_DET or its description.
In some respects Class methods are similar to function modules in that they are a coding block that performs certain ABAP functionality. Methods can be referenced using the following syntax: CALL METHOD WRF_AT_MESSAGES_DET=>methodname EXPORTING/IMPORTING...
Class attributes can be referenced using the following syntax WRF_AT_MESSAGES_DET=><attribute name>
Although depending on where you are inserting the ABAP code
you do need to check if the attribute is public or private.
Events are created within your class using special event handler methods. These must be registered at runtime for the event and can then be triggered using the ABAP syntax: RAISE EVENT <event name> EXPOTING...