Setting null for single-valued navigation property using Xrm.WebApi

Question

We are in the process of remediation, re-engineering old JS web resources for latest D365 v9 sdk changes w.r.t Client scripting API improvements & deprecation.

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Answer 1

To set null on the lookup use:

var data = { _[LookupFieldName]_value : null } 
Xrm.WebApi.updateRecord("abc_entity", abc_entityid, data).then(successCallback, errorCallback

For example to remove contact.parentcustomerid field value you need to use:

var data = {};
data._parentcustomerid_value = null
var t = await Xrm.WebApi.updateRecord("contact", "{0200E6F5-1D21-E811-A954-0022480042B3}", data)