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Sandy GaliSandy Gali 

Update a custom field with partner value on opportunity

Hi guys,
My requirement is to update the name of the primary partner on a custom field (lookup to account) on opportunities object.
I tried to create a trigger on partner object but saw that it was not supported. I also tried a combination of process builder and flow to update but that was going to infinite loop as I was triggering it on update or insert ( silly me )
Do you have any suggestions on how this scenario can be handled.
Sandy can you post the screenshot of Process or trigger 
Sandy GaliSandy Gali
User-added image

This is how the flow looks, but I think the main issue is how to update the partner value as we cant have triggers on partner object or opportunitypartner object
Can you post detailed schema screenshot with Record Lookup and Record Update images