In 2 Corinthians 5:21, it is written,
God made the one who did not know sin to be sin for us, so that in him we would become the righteousness of God. (NET)
τὸν γὰρ μὴ γνόντα ἁμαρτίαν ὑπὲρ ἡμῶν ἁμαρτίαν ἐποίησεν ἵνα ἡμεῖς γινώμεθα δικαιοσύνη θεοῦ ἐν αὐτῷ (TR, 1550)
What is the proper interpretation of this verse? In what sense was Christ "made sin"?