How to Set RelationShip field value result as onFormPopulated ?

オフライン

I have a itemtype call 'Part' , 

Part has a field call 'part price'  (type is decimal)

Part has a relationship call Part_detail

Part_detail has a field call 'RP price' (type is int).

I need "part price" to have thousand separator, but it is only for displayed, and does not need to be in the database after save

so I use onFormPopulated event to set

code as :

document.getElementsByClassName('part_price')[0].value = originalValue.replaceRegExp, '$1,'$2');

It is work !

but I need "RP priceto have  thousand separator ,too !  It is relationship  and has no onFormPopulated event to code 

What should I do to have the same effect as "part price" (thousand separator just for show , not need to save in database )?

and where I can edit relationship DOM ?
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