How to update Product object in Incident Workspace

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Hi,

I am creating a custom process which will be triggred whenever the asset is selected and will update the product associated with the asset.

The Asset object is associated with Custom Object serviceProduct ( confusingly the same name ServiceProducts primary object) which is associated with Product Object (datatype : MenuType).

By using ROQL query I am able to fetch the desired value ( menu type).

The Relationship between the Primary Object Incident , Asset, Product & Custom Object serviceProduct is as below:

Asset.service_product_id -->CO$serviceProduct.ID

CO$serviceProduct.ser_prod_product_id--> Incident.Prod_id

Below the script but not able to find a way to set the Incident->Product to ser_prod_product_id