RE: Update/Insert of Sales Line

You could use the Cross-reference tool on the insert, update and write methods on the SalesLine table. Also do it directly from the table to get the list of Forms where SalesLine might be used.

msdn.microsoft.com/.../aa626961.aspx

Building cross-references could take a couple of hours if you do not already have that. You can do it faster if you execute it in a batch:

http://www.alexondax.com/2014/05/howto-update-all-cross-reference-xref.html

That will tell you all places, like \Classes\SalesLineType for example.