The group led by Maj Gen Satbir Singh (retd) met Suhag today at the Army headquarters.
"We met him requesting to use his good office to convey to the government that there is no multiple definition of OROP as as been said by various people from the government," Singh told PTI.
He said that the Army chief is not only responsible for the welfare of the serving personnel but also the ex-servicemen.
"The Army chief suggested if we could postpone it. We told him that we will go ahead with our plans as it is not against any government or person but only to highlight the injustice being done against us," he said.
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One rank, one pension scheme has been a long-standing demand of nearly three million ex-servicemen in the country.
It seeks to ensure that a uniform pension is paid to defence personnel who retire at the same rank with the same length of service, irrespective of their date of retirement.
Modi said the issue is not as simple as he had thought but much more "vexed" as "problems" have been added to it over the years.
Defence Minister Manohar Parrikar today said the issue of OROP is progressing very rapidly but some patience is required.