Hi,
'Touched' field and SetTouched() method is used to allow the execution for checking the credit limit and update salesTable.Estimated if eligible.
Note: You can also navigate to the Path and confirm the purpose
For eg: AOT -> Classes\SalesCopying\copy
This field will be set to Yes and No at runtime and so it was set to properties( Save contents :'No' and Visible : 'No')