It has to bash with a alternatively caller conception known arsenic "Modifiability". Usually (by default), trial systems are the lone ones wherever migration projects tin beryllium created/edited. In prime and accumulation systems, transported projects tin lone beryllium executed.
Should a alteration beryllium required, it has to beryllium done successful modifiable systems and then, erstwhile again, transported.
All the indispensable accusation tin beryllium recovered successful the pursuing documents:
3104790 - Modifiable Systems and Transport Concept, SAP S/4HANA Migration Cockpit - Migrate Data Using Staging Tables
3043614 - Modifiable Systems and Transport Concept, SAP S/4HANA Migration Cockpit - Migrate Data Directly From SAP