How to raise business exception, /IWBEP/CX_MGW_BUSI_EXCEPTION?

I have to rasie exception /IWBEP/CX_MGW_BUSI_EXCEPTION within a backend method, which will be called by the GET_ENTITY method.

I have caught the exception into a reference LR_BUSINESS_EXCEPTION.

lr_exception is the importing parameter for the backend method called.

Should I use the following code

Or should I raise the exceptionas per the below code

In this case how should I populate IIO_MESSAGE_CONTAINER based on the reference LR_BUSINESS_EXCEPTION.

Please advice.