How to display custom error message if the Required field is not entered?

Hi,
I have made one input field as required field in a view.
I want to display one custom error message ,if the required input field is not entered.
Please help me regarding this.
Thanks,
Deepika

hi deepika....
First go to message pool under webdynpro components.
Create a new message there..of type error.
Enter your text.
Now to avoid null pointer exception , in wdDoInit(), initialise the value
wdContext.currentDateTimeElement().setDate("");
now create an action for submission of data. If field is empty, then within the button write:
msg = wdComponentAPI.getComponent().getMessageManager();
if(wdContext.currentDateTimeElement().getDate().equals(""))
msg.raiseMessage(IMessageCompTodatDateTime.ERROR,new Object[]{""},true) ;
between begin others put:
regards,
pinki
IWDMessageManager msg = null;

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CREATE OR REPLACE PACKAGE BODY APPS.XXPO_COSTFACTS_WEBADI_PKG
AS
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                          P_CONTAINER_ID IN VARCHAR2
                        , P_SAIL_DATE IN DATE
                        , P_PO_NO IN VARCHAR2
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    ln_temp         NUMBER;
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