Validation for records inTable maintaince generator

Hi friends,
I have created a table ZSTUDENT_INFO. and i have created a table maintaince generator for it....
now i have fields...
ZSCHOOL , ZCLASS , ZNAME , ZAGE , ZROLLNO.
now i have school and class as key fieilds....
now my requiremnet is when the user his entering his records
case 1) for same school and class the roll number is unique ie : we cant have 2 persons with same roll numbers
                    for example :
                         school        class      name     age     roll no
                            Adams      4            rahul       8         2
                            Adams      5            Rahul      9         2
                           adams       4            kiran        8         2
ist 2 records are differnet ist record is 4thclass and 2nd record is for 5th class but the rd record is same as ist record...
now in this case the user should not able to save the 3rd record as alredy same record is there..
case 2) when the user is entering the record he should check in the table whetther the same combination alredy exits in teh table or not .. if exists it should give us an error mesage saying data already exits..
How can i do this and where should i do this...
Regards
Satish

Hi satish,
First of all if it is a key field system will take care of giving the duplicate record error.
If you want to do any validations in table maintenance generator. Please check the following links or search the forum
with the Table Maintenace Generator events.
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/8129f164-0a01-0010-2a8e-8765287250fc?overridelayout=true
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/8129f164-0a01-0010-2a8e-8765287250fc
If i misunderstood your requirement, please elaborate the question.
Thanks

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