Avoid the RBAR. Make a persisted computed column that uses a formula like MTRANS_ID%999+1. Yeah... it'll have gaps, now and again... just like the IDENTITY column
--Jeff Moden
RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row. First step towards the paradigm shift of writing Set Based code: ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
Change is inevitable... Change for the better is not.