If only a part of the product is returned for repair, the user should update the 'CusReturnPart' before registering the customer deviation (CDV).

This can be done from the exisiting customer shipping adivce item (CSA-ITEM) 

1. On the  shipping adivce item (CSA-ITEM) choose: 'Create deviation' 

2. In the pop-up, find the correct Life Cycle management (LCM) document 

3. Enter the specific LCM and choose correct part. 

4.Register CDV'.

Another option is to choose from the context menu: "Select Source Fields" on a Customer deviation (CDV) in status 1 or 2.
This too will open the pop-up as shown above where you can choose the Life Cycle management (LCM) document and the specific part: