Account Structure Main account Criteria Problem

Hi Gurus,

I Create my chart of account and main account by following structure(Hierarchy Setup, China main account hierarchy).

Account Number Formats: XXXXXXXXX

Level 1, Length(4)

Level 2, Length(2)

Level 3, Length(3)

Balance Sheet Accounts Sample: Table 1

Profit and Loss Accounts Samples: Table 2

Now i want to create two account structure for them.

1. Balance Sheet Account Structure for Table 1 (Main Account 1000 - 4000, 100000 - 400000, 100000000 - 400000000)

2. P&L Account Structure for table 2( Main Account 6000 - 7000, 600000 - 700000, 600000000 - 700000000)

if i create the range 1000 - 4000 and 100000 - 400000 , the filter 100000 - 400000 will be remove automatically, but if i create two main account filter node with one 1000 - 4000 and another with 100000 - 400000 , the system will note : " the node with criteria 100000 - 400000 overlaps the node 1000 - 4000.

i'm confused why the criteria 100000 - 400000 can overlap 1000 - 4000 ?

Thanks.