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lookup column could not update using rest api

Question asked by Ranjith kumar on May 17, 2018
Latest reply on Jun 6, 2018 by Ranjith kumar



When i  trying to update Lookup column using REST API, getting Error Below (Standerd Columns are Updating Fine)


{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"A 'PrimitiveValue' node with non-null value was found when trying to read the value of a navigation property; however, a 'StartArray' node, a 'StartObject' node, or a 'PrimitiveValue' node with null value was expected."}}} Bad Request


In the Workflow steps: im using Merge method and ín the lookup Value passing the ID of Lookup values 
am i doing right?