Anybody ever face issues adding a custom transaction line field to pull in the related items type?  Using a formula to default it - 

CASE WHEN {item.isserialitem} = 'T' THEN 'Serialized' ELSE {item.type} END

 .It only returns ‘Serialized’…..

I've had trouble using a formula as a default value. I think it has to do with the timing of when the field tries to default a value and when the user is actually entering the data You could try using a workflow to set this instead of default value formula Probably an after record submit Reiner on a sublist group would work

When you save the transaction, are the values still incorrect? If I remember it correctly, the last time I created a custom transaction line field where Store Value is unchecked and makes use of a formula, it does not set the correct value until the transaction is saved. Not sure if that's the standard behavior but that's what we noticed. It seems to be triggered After Record Submit.