How to display error message in Shopping Cart?

How to display error message in Shopping Cart and stop the shopping cart for further processing? I try MESSAGE w001(zshop) or MESSAGE e001(zshop). But it is causing run-time error.

Hi Paul,
In the DOC_CHECK or DOC_SAVE BADI, you have a global internal table named et_messages. The structure of this table is 'bbp_smessages_badi'. You can append your error message here by inputting the message type, ID and number. The message type is either 'E' for error or 'W' for warning and the number would depend on your message class(ID). You will be able to see the error message on top of the screen, can be a red or yellow highlight depending on your appended message. I don't think creating the error message via the MESSAGE syntax will be successful, maybe this is why you are getting a runtime error.
Regards,
Noel

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