Pretty similar to Set Picklist field to blank with Process Builder, is it possible to do this for lookup fields? The only workarounds I'm seeing is doing this in a separate flow, which kind of offsets the advantages of doing a complete business logic in one visually clear process...
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believe its limitation : here's an open idea for date fields but believe it applies to all non text fields - success.salesforce.com/ideaView?id=08730000000Dk1MAAS – Vamsi Krishna Gosu Apr 29 '15 at 13:15
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Can you set it to null? – Davin Casey Apr 30 '15 at 9:24
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Not that I know of, leaving the box empty and saving just throws an error that a value is required. – Robin De Bondt Apr 30 '15 at 10:25
My answer from the other post works here too; the process builder now supports usage of $GlobalConstant.Null on lookup fields. For example, the Contact Owner lookup: