Data Transform Utility with update operation : How to define Source Object and Destination Obect fo

 Hello,

I want update   destination business object with data from Source business Object with help of a datamap. DataMap is defined in 'Administration - Application'/'Data Map Administration'. I found no sample in bookshelf for such tranformation. 

Do you have described sample using this method with operation update ?

Do you know how to position Source and Destination buscomp to specific record ?

thanks

Jean-Marc