TOKYO, Jan 13 (Reuters) - Yields on Japan's benchmark 10-year government bonds breached the central bank's new ceiling on Friday in the market's most direct challenge yet to decades of uber-easy monetary policy. The central bank already holds 80% to 90% of some bond lines. REMEMBER THE RBAThere is talk in the markets that the central bank could shorten its yield target to three- and five-year bonds, but history abroad suggests the strain will remain. With the local economy recovering faster than expected and inflation accelerating, the RBA realised its pledge to keep three-year yields at 0.1% out to 2024 was no longer credible. So it abruptly dropped the whole thing and three-year yields spiked to 0.48%, an episode the RBA itself conceded caused "reputational damage" that would not be repeated.

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