The Metropolitan Opera will open its "Der Rosenkavalier" on Monday, April 18, and not as reported in yesterday's editions. Also, the performance of "La Forza del Destino" on April 30 is not a matinee. It will be at 8 p.m.

The Metropolitan Opera opens its annual two-week run at the Kennedy Center next Tuesday night with Richard Strauss' comic opera "Der Rosenkavalier." It will be repeated twice--marking the first time the Met has performed an opera three times on a visit here.

In two of the performances (April 18 and 29), the central role of the Marschallin will be sung by soprano Elizabeth So derstro m. Evelyn Lear will sing the Marschallin on April 21. In the role of Octavian, Frederica von Stade will perform in all three performances, as will Kathleen Battle as Sophie. Bass Aage Haugland is to sing Baron Ochs in each performance, and the Met's music director, James Levine, will conduct.

This year Levine will conduct 8 of the 14 performances here.

On April 19, the night after the opening, Renata Scotto is to perform in the soprano vehicle "Adriana Lecouvreur" by Francesco Cilea. Joining her will be mezzo-soprano Bianca Berini, tenor Neil Shicoff and baritone Sesto Bruscantini. The conductor is to be Michelangelo Veltri.

Following that will come Mussorgsky's "Boris Godunov," done for the first time here since the Bolshoi Opera performance during the Bicentennial. The title role will be sung by Haugland, and James Conlon will conduct. This production restores Mussorgsky's original scoring, replacing the Rimsky-Korsakov orchestration that is common in most versions.

Puccini's "La Bohe me," staged by Franco Zeffirelli, will be performed twice, both times under Levine. Soprano Teresa Zylis-Gara will be Mimi in the first performance, on April 22, Patricia Craig will be Musetta, Giuliano Ciannella will sing Rodolfo and Richard Stilwell will be Marcello. In the second performance (April 25), Washington soprano Myra Merritt will sing Musetta.

The Met's controversial new production of Verdi's "Macbeth," staged by Sir Peter Hall, will be done on April 23 and April 26, under Levine. The title role will be sung by Sherrill Milnes, and Renata Scotto will be Lady Macbeth.

There will be two performances of "Lucia di Lammermoor," under Veltri, with Ashley Putnam in the title role. Tenor Neil Shicoff will sing Edgardo. They will be on April 23 and April 27.

Finally, one performance of Verdi's "La Forza del Destino" is scheduled, in a matinee on April 30. Levine will conduct and the Leonore is to be Leona Mitchell.