Credit for tds to a non resident

Dear sir,

1. we want to pay fee for technical service to a nonresident german after deducting tds . how much tds to be deducted . as per sec 195 10% to be deducted if a central govt approved agreement only. if no such agreement or agreement with local authority  or state govt  how much tds to be deducted?

2. credit for tds deducted in india be available for nonresident german in his country or not? please help me. its very urgent