PROBLEM IN CUSTOMER CREATION

hi

friends

when i am creating customer master data by xd01 an erros is coming----

Sales area INSO ID CP is not defined for customers

this is my sales area

i have checked all set up

sales organisation to distribution channel

sales organisation to division

set up sales area

even in database table TVTA entry is there

also customer creation screen if i click all sales area tab i sales area is not appearing

though it is coming

but it is allowing me to creat customer under company code view through fd01.

i am working in ecc 6 version this is totally new system & i am configuring sd module 1st time.

plz give some quick solution

ambarish