We are using sap business one 2005B.
Just from few days, we are not able to create sales order ,sales quotation. whenever we specify the tax code, it says rate code for tax parimeter is missing. we have checked in adminsitration > financials > tax .... The tax code, rate is defined properly. there are no changes done.
I suggest that you enter in the Adminstration
>Tax>Tax Paramater and see if there is in your code tax the following fields, like below:
Rate ---Just this on is madatory Field
I hope to help you.