Underlining that the government will safeguard interests of soldiers retiring at an early age through higher pensions, Finance Minister Arun Jaitley said that annul revision in pensions does not happen anywhere in the world.
He said the government was committed to OROP but the "only difficulty" is the "arithmetical translation".
"I have my own formula on what OROP means. Somebody else may have their own formula on OROP but it has to be within reasonable and rational criteria. You can't have an OROP where pensions are revised every month or every year," he said.
"I have been very vigilant about fiscal prudence and therefore my job is really that of a housewife in the sense that you must measure every rupee that the house spends so that you don't overspend and then borrow and if you start borrowing beyond a point and indulge in fiscal indiscipline," Jaitley told ET NOW.
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Ex-servicemen have been agitating for 78 days at Jantar Mantar here demanding implementation of OROP.
Reacting to Jaitley's statement, Lt Gen Balbir Singh (Retd), President of Indian Ex-Service Movement, who has been leading the back channel talks along with Maj Gen Satbir Singh (Retd) with the government said the veterans are ready for biennial increase.
Asked if further talks would be held with the government, he said they would if the government seeks so.
"We have to talk. Ultimately a solution has to be found. OROP cannot remain in wilderness forever," he said.
The developments came even as three more ex-servicemen joined the fast-unto-death agitation, taking the figure to 12.
Meanwhile, senior lawyer and former BJP leader Ram Jethmalani also extended his support to the protesting ex-servicemen and visited them at Jantar Mantar.