Message Types in Method Return Parameters for SAP Modules

In general when you call a method of an SAP module, the return parameters returns all the messages that are issued about the method call.

These issued return parameter message types are summarized as :
Message type: S Success, E Error, W Warning, I Info, A Abort

Where the S,E,W and I stands for the following corresponding detail:
"S" for success messages
"E" for error messages
"W" for warnings
"I" for information messages