This maybe handy for some of you out there. Every now and then the client will require more tabs and / or buttons than what SAP provide. I think you can have 10 tabs and 15 buttons as standard.
But there are some SAP Notes that take through the process to allow for more. I am not a techie, so I will list the notes that are applicable. We have done this recently in a ECC6 system, but the same applies I think to other versions.
Notes are 522431,527763, 533462. There are three because I think the first note was not completely correct.