SQL Trigger Max Length


I have the below trigger which works fine. I want to amend the trigger to only INSERT a maximum length of 30 characters. Can you please assist?

ON Transheaders  
Set ZCustomerRef = ExtraText
Where AccountID = 'CAWWWEBXXXX' AND TransactionType = 'CO'  

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Nitin SontakkeDeveloperCommented:
You refer to INSERT while trigger is updating the table. I see that the trigger itself is on INSERT operation. Which column are you referring to for max length of 30 is not clear.

From where ExtraText coming is also not clear.

update [transheaders] set
  [ZCustoerRef] = substring([ExtraText], 1, 30)
where [AccountID] = 'CAWWWEBXXXX' 
  AND [TransactionType] = 'CO'   

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