How to restore AIF service in AX 2012 after running the wizard for service update?

Hello,

I updated the ASN service query. I added another datasource.

After that I updated the service using the wizard that generated all the classes for me.

But then I started getting this error in the class  "AXShipCarrierShippingRequest"

Method name:    parmUnitId

Error line :           this.validateInboundString(_unitId,dictField,this.mapPolicy().xMLMapUnitId());

Error: The method xMLMapUnitid() does not exist in the class : AXMapPolicy

If that is the case, why is my AIF framework referring to this method?

This method does not exist in my AOT.

Now, I want to restore the ASN service the way it was shipped. Is there a way I can restore it back to it original form so that it atleast runs without errors?

Thanks for your support.