Filter Regarding Field to show the specific entities in D365 CRM(CE)

Introduction: In this blog, we will understand how to show specific entities in Regarding Field.

Use Case: In my example, I have created a custom Filed ”regarding type”, which is option set, based on the input from the option set value I have set the Entity Type in the below code:

// JavaScript source code
var formCustomizations = {
    filterRegarding: function (execContext) {
        var formContext = execContext.getFormContext();
        if (formContext.getAttribute("new_regardingtype").getValue() != null) {
            regardingtype = formContext.getAttribute("new_regardingtype").getValue();
            if (regardingtype === 1) {
            else if (regardingtype === 2) {
            else {
                formContext.getControl("regardingobjectid").setEntityTypes(["contact", "account"]);

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