Payment difference configuration

Dear all,

I want to configure for payment difference of vendor. Steps to configure:

- OBA3: Customer / vendor tolerance: I set 500 for gain / Loss

- OBA4: Tolerances for Users: I also set 500 for revenue / expense

- OBXL: account determination for payment difference

But when I post outgoing payment with difference 20, system always raise message: "The difference is too large for clearing". I dont know if I miss any steps ?

Thank you very much for your help,

Sylvecat.