Transformation Not Null logic

Summary:

hi Gurus,

Some time Null pointer error is coming for RMA or normal orders. Kindly explain the logic on how to avoid it. Lets assume the below case

If customer is X and its a normal order populate EFF attribute2= 'Y' no Else condition, if RMA is created for the same order do we need to create another not null rule or system would allow with just the above condition

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