This is another way to do this,

If Chart Of Account - Oman Accounting App is not available in Odoo Apps .

However follow steps for configure : Chart Of Account (COA) for OMAN

1) Install Accounting And Generic - Accounting Odoo App.

2) In Settings => Companies Menu ,Activate 'here' a new currency(According to Country’s Currency

For Example OMAN : Oman Rial / OMR currency ) before creating a new company.

3) select OMR currency as your company currency in company view.

Then you can see Oman Rial / OMR currency and view default chart of account, journal, taxes.

I hope this will help you.

Thanks!