How to make the fields of the table mandatory while creating new entries..?

Hi,
I have created a new Z table which has 6 fields. All the 6 fields are KEY fields and all are of CHAR type. I have generated the table maintenance generator for the same. My requirement is all the fields should be MANDATORY while creating the entries. No field should be BLANK.
When creating the new entries in the table, even if I don't give any values to some of the fields, it is saving the entry. But, it shouldn't happen like that. If any of the field is kept blank, it should not allow the user to save the entry. Can someone tell me how to approach this. Will there be any settings while creating the table which takes care of this.
I read somewhere that this can be done using the Table EVENTS. Can someone tell me what is the code that we should write there in the Events which prevents the user from saving the blank fields. While writing the logic in the events, how to check whether the particular field is BLANK or not. Will the values be stored in any internal table kind of thing..?
My table name is ZCRF_TAB and the fields are FLD!, FLD2, FLD3, FLD4, FLD5 & FLD6. Can someone provide me sample code for my requirement. Thanks in advance.
Best regards,
Paddu.

Hi,I think u have generated Table Maintainance Generator, goto Environment->Modifications->Events
Select appropriate option by using F4,I think value 05 is appropriate for u r requirement.Enter From routine name.Dbl click on the routine.
Write the appropriate code like:
If ZTABLE-FIELD1 is initial.
Message (E000) with "Fill all the manadatory fields".
Thats it.Just look at the following docu with screenshots,by this understand how u can use Table Events:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/abap/how%20to%20implement%20events%20in%20table%20maintenance.doc
Regards,
Rock.

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Environment: SQL Server 2008R2
Tools: MSMS
Code:
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USE [DLPT_CMS1_RESTORE]
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[id] [int] IDENTITY(80,1) NOT NULL,
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[PE9] [varchar](8000) NULL,
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I added a new data which shows inaccurate results using your last updated code. The mistake appears in the 3rd row culomn name PE25 is null but counts it as 1
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[id] [int] IDENTITY(80,1) NOT NULL,
[Login_ID] [char](10) NULL,
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[PE28] [varchar](8000) NULL,
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from mocha

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