TypeError: cannot assign to read only property ‘referenceControl’ of object ‘[object Object]’ Typescript + Angular

The below class has the following properties, which is auto-generated form swagger library

export class GetControlForPolicyDesignerView implements IGetControlForPolicyDesignerView {
    control!: ControlDto;
    referenceControl!: AuthorityProvisionListDto[] | undefined;
    referenceCount!: number;
    association!: boolean;
    selected!: boolean;
    statements!: StatementViewDto[] | undefined;
    // ......
}

Interface

export interface IGetControlForPolicyDesignerView {
    control: ControlDto;
    referenceControl: AuthorityProvisionListDto[] | undefined;
    referenceCount: number;
    association: boolean;
    selected: boolean;
    statements: StatementViewDto[] | undefined;
}

In one of the class in Angular, I am assigning the value to the property below

Initialize the property at the beginning

selectedControl: GetControlForPolicyDesignerView = new GetControlForPolicyDesignerView();

Then assign the value to the property

this._guidanceBuilderDataService.selectedControlUpdate.pipe(takeUntil(this.unsubscribe)).subscribe((selectedControl) => {
                this.selectedControl.referenceControl= selectedControl?.referenceControl;
                this.selectedControl.referenceCount = selectedControl?.referenceCount;
                this.selectedControl.statements = selectedControl?.statements;
        });

Error

ERROR TypeError: Cannot assign to read only property 'referenceControl' of object '[object Object]'
    at SafeSubscriber._next (guidance-designer.component.ts:223:99)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:183:1)
    at SafeSubscriber.next (Subscriber.js:122:1)
    at Subscriber._next (Subscriber.js:72:1)
    at Subscriber.next (Subscriber.js:49:1)
    at TakeUntilSubscriber._next (Subscriber.js:72:1)
    at TakeUntilSubscriber.next (Subscriber.js:49:1)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:183:1)
    at SafeSubscriber.next (Subscriber.js:122:1)
    at Subscriber._next (Subscriber.js:72:1)

Tried code, but didn’t worked

(this.selectedControl.referenceControl as AuthorityProvisionListDto[]) = selectedControl?.referenceControl;