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Thank you for your submission. We do need more information as Steven has also commented, you would not trigger the crossover from the YORN but from another key value.
I'm not understanding the use case. Crossover domains are intended to set attributes on the record based on values in another object. For example, crossover ASSET data onto a WORKORDER. You tie the crossover domain to the attribute being set (such as ASSETNUM) that allows you to get the record (ASSET) to retrieve the other attributes to set (such as the CINUM out of the box). You do not tie the crossover domain to the attributes you want to set because the crossover domain will only fire when the attribute it is associated to is modified.
You can set a YORN attribute via crossover but a YORN attribute wouldn't be the trigger so you wouldn't tie the crossover domain to the YORN attribute. In the example provided, the ITEMNUM would be where you associated the crossover domain with a validation where clause of itemnum = :itemnum and itemsetid = :itemsetid and you'd have that bring over your YORN attribute.