Creation of Invoice for mulitiple Operating units using Single responsibility

Hi,

1. I have created one OU1 and MO:Operating Unit Profile has been set to OU1 for Payables Resposibility and implmented the entire Payables.

2. I am able to create the invoice & making the payments using OU1.

3. Now, i have created one more operating Unit OU2.

4. i would like to create the invoice using same responsibility with OU2. but i can't create the invoices using OU2 unitl payables setup completed for OU2.

Question: How to do financial setup in payables module for two operatings units & how to create the invoices with multi operating units.

Regards,

Madhu