Wrong GL Default on PO

Hi All,

Pls advise on the below.

When a Purchase Order is created off a Work Order, the system is currently determining what GL Account to default.

Amount under $100 is set to GL Acct 410000 and over $100 is set to GL Acct 401200.

1. Dollar amt under $100 is expected to default to 410000
2. Dollar amt over  $100 is expected to default to 401200
3. Instead every PO defaulting into GL Account 410000 including the dollar amt over $100.

Pls advise on how to make this change to enable dollar amt over $100 defaulting to gl acct 401200.

Regards

Femmy John.