Javier Pariente, who didn't hold any position in the last government, acted as an intermediary between the government and the company Lerkshore International Limited, which was awarded a contract for $14.5 million for the supply of dehydrated food to schools in 2010.
That was established in an interview in June by former National Assistance Program (PAN) Director Giacomo Tamburrelli before prosecutors in which he named Pariente as being a key figure in the awarding of the contract.
Tamburrelli, who is being held under house arrest, confirmed what he had told prosecutors in October.
The statements prompted prosecutors to summon Pariente to testify in the case. He will be asked questions about Lerkshore International Limited owner Rubén De Ycaza.
Pariente is vice president of Importadora Ricamar, S.A., which is the importing company controlled by former President Ricardo Martinelli, who fled the country in early 2015.
Prosecutors have claimed that the contract included massive cost overruns in the contract, which was awarded by the PAN without going through a competitive bidding process.
Tamburrelli has also implicated Martinelli's former private secretary, Adlofo "Chichi" De Obarrio, who is a fugitive from justice.