logical QA grandfather,father,son.....

i have an itab (level,matnr,parent) someting like itab tree.

my problem is the numric of the level.

here the examp.

level-1 matnr-75835 parent-

level-1.1 matnr-15500 parent-75835

level-1.1 matnr-50700 parent-75835

level-1.1.1 matnr-66300 parent-50700

level-1.1.1 matnr-66100 parent-50700

level-1.1.2 matnr-76000 parent-50700

level-1.2 matnr-72000 parent- 75835

i wnat to update the level field to the right level, ican not get duplicate level as it seams in the examp.

thanks friends.