Dear Mohan,
1.Check these for Integration switch:
PLOGI PLOGI ___ (PLAN VERSION)
PLOGI ORGA X (OM PA Int. ON)
PLOGI PRELI 99999999 (Default position)
2. In which mode you are updating OM data either LSMW / BDC ? try test recording for OM data updation then you will come to know the format.
if you are doing through LSMW then check my given document link for reference in that template also there.
3. First you have to create number ranges (OONR) then you have to update OM Data.
Best Regards