Why can't the GOA draw on the third tranche or sign the medium term 1.5 billion credit with the commercial banks if the British don't accept a delay in the IMF's condition?

After the Falklands War, Argentine Ambassador to the U.S. Garcia del Solar (GDS) raised the question of foreign debt during a courtesy call on U.S. Assistant Secretary of State for Inter-American Affairs. GDS said sectors within the military, especially the air force, did not want to pay the foreign debt. The GOA was subject to constant public and political pressures and criticism. With inflation and increased union demands the economic situation was becoming increasingly difficult. The Junta had earlier allowed the British banks to remit earnings but did not agree to lift the sanctions on other British firms without a reduction in the exclusion zone. The air force, which is very nationalistic, has taken a strong position on this issue.GDS said the British were being quite firm on the IMF requirement that Argentina lift the sanctions on remittance of dividends to the UK. If the British don’t accept a delay in the IMF’s condition, the GOA will be unable to draw on the third tranche or sign the medium term 1.5 billion credit with the commercial banks.
Due to my limited knowledge about IMF operations, I don’t understand why the Government of Argentina will be unable to draw on the third tranche or sign the medium term 1.5 billion credit with the commercial banks if the British don’t accept a delay in the IMF’s condition. Please help. Thank you very much.