CREATE TABLE table_65124 ("Player" TEXT, "Int'l Debut" TEXT, "Year" TEXT, "Cross Code Debut" TEXT, "Date" TEXT, "Position" TEXT)

What was the Int'l Debut for a player in the back position, that also had a Cross Code Debut of RU Australia v Wales?
SELECT "Int'l Debut" FROM table_65124 WHERE "Position" = 'back' AND "Cross Code Debut" = 'ru australia v wales'
SELECT "Int'l Debut" FROM "table_65124" WHERE "Cross Code Debut" = 'ru australia v wales' AND "Position" = 'back'