HI Edgar,
Any SAP Implementation will start with definition of Enterprise structure. Key elements like client, controlling are, company code, profit center etc are basic building blocks of enterprise structure from FICO side
On a key note, I can say sequence is not predominantly defined. It all depends in cross module integration business processes defined in your blueprint.
But in all my experience, first step is taken from FICO side. Remaining all other modules go hand in hand.
Regards,
Amol
