If you have to find a Transaction Code for IS-U: there is a simple transaction code for searching of transaction codes which is not well-known. The transaction code "EASY" for finding transaction codes in the IS-U. In this transaction you can search by topics or in all areas by placing flags.
Blog about different topics, some of them SAP BW, SAP ABAP and SAP IS-U
Blog über verschiedene Themen, u.a. SAP ABAP und SAP BW und SAP IS-U