Validation in a Delivery note in Migo transaction.

[Vishal__2546]

Hi, sap community,

I want to put the validation in the delivery note in the Migo transaction such that the inputted delivery note number is not greater than 10. 

I Knew the Badi =  MB_MIGO_BADI.

And the method is CHECK_HEADER.

The question is how to approach this problem and can you guys help me with the code part as well? Please tell me step by step process.

Thanks.