How to use the cases in button action?

Hi Experts,
I want to get a prompt message if the field is empty.I got it but at the same time if the field is filled I want the other action to be performed that is to call a BAPI and give me output.How can I give two events for the same action.
How to use the cases in button action?
So, please guide me.Urgent need
Regards
Nutan

Hi Nutan,
if I understand you, then you have a simple validation. Therefore you can use the validation functionality of VC for your components. An alternative could be by writing a new ABAP RFC function module like:
BAPI Input parameters as input and BAPI output parameters as output and an additional return code or string for a message:
IF I_FIELD IS INITIAL.
E_RETURN_CODE = "THE FIELD IS EMPTY."
ELSE.
CALL FUNCTION <YOUR_BAPI>
<BAPI PARAMETERS>
ENDIF.
I hope that helps.
Best Regards,
Marcel

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