like how you want create the material master number range.
The material number is output in the length defined in table TMCNV; where
appropriate, it is filled with leading zeros by the system. The template
is made up of editing characters and selection characters; an underscore
(_) denotes a selection character that is replaced by a significant
character in the material number.
Length of material number 10
Material number 12345678 (significant characters)
The editing characters are included in the length of the material number.