OK, let me explain...

The script I posted is just an example(my real example is different and much more complex,but this doesn't matter), what I need to understand is why when we have a MERGE STATEMENT WHICH KEEPS HISTORY, WHEN AN ENTRY IS OBSOLETE AND THEN IT IS ADDED AGAIN IN THE UPDATE TABLE, IT IS NOT UPDATED IN THE MAIN TABLE AND IT IS STILL SHOWN AS OBSOLETE....if you have suggestion regarding this, it will helps. Thanks