OREANDA-NEWS. March 10, 2015. Most euro zone government bond yields fell on the first day of the European Central Bank's sovereign debt purchase programme, with only fears about Greece's funding spoiling Monday's launch party.

German 10-year bond yields -- the bloc's benchmark -- fell 4 basis points to 0.36 percent, clawing back ground lost on Friday after strong U.S. jobs data raised the chance of an interest rate hike in the world's biggest economy.

Other euro zone equivalents opened around 2-5 bps lower, except for Greek 10-year paper which rose on concerns the European Union might reject reform proposals vital to unlocking new bailout cash for Athens.

"Markets will open a new chapter today," said Commerzbank strategist David Schnautz.

Euro zone finance ministers are meeting on Monday in Brussels to discuss a letter of pledged reforms sent by Athens last week.

The chair of the meeting, Jeroen Dijsselbloem, said on Sunday that the Greek proposal was not enough to unlock further aid. Time is pressing because Greece is expected to run out of cash later this month.

Should Brussels ultimately reject Greece's proposals, the country could call a referendum or have early elections, its finance minister said on Sunday.

Greek 10-year yields opened 8 bps higher at 9.58 percent .

This nervousness also saw lower-rated debt in the euro zone, which is expected to have the most potential to perform under quantitative easing, slightly lag the rally seen in German and other top-rated bonds.

Italian and Spanish 10-year yields dipped 2 bps to 1.30 and 1.22 percent, respectively.

After months of speculation, investor attention is now fixed on how the ECB's programme will work in practice.

While analysts expect a smooth start for the programme as overseas holders of euro zone debt swap bonds for higher-yielding U.S. or emerging markets debt, questions remain over how willing domestic investors will be to sell.

In Italy, for instance, 70 percent of bonds are held domestically, according to RBS research.

"Domestic investors are not likely (to sell) ... either because of tax treatment, preferred habitat and lack of alternatives -- unless new regulatory measures incentivise banks to liquidate (large) holdings," RBS analysts wrote.

With ECB chief Mario Draghi dismissing concerns last week that the ECB may struggle to implement its 60 billion euros a month QE programme, many think the rally in euro zone government bonds may have much further to go.