RE: fetching job id in sales invoice list
                     
                    
                      
                        What do you mean by "job is associated with the sales invoice or at the sales invoice creation" - I'm sorry, I still don't understand your scenario. Can you please describe your scenario step by step like:
1. User (or integration or whatever) creates Invoice.
2. User (or integration or whatever) populates the "Job" lookup field in the form of an Invoice.
3. Automatic process triggers on that event and updates an Invoice's "Job Id" field with "Job Id" field from the "Job".