APCH CTLR DSNDED ACFT PRIOR TO ENTERING HIS AIRSPACE; THEN QUESTIONED THE RPTR'S ACFT ON THEIR ALT. CAPT DISCUSSED THE SIT WITH A SUPVR UPON LNDG AND WAS TOLD THAT NO SEPARATION WAS LOST AND THAT THE CTLR HAD COMMITTED AN OPDEV.

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WE WERE FLYING FROM SMF TO SNA. WE WERE TALKING WITH SOCAL. WHEN APCHING THE COASTLINE OFF OF SNA; APCH ASSIGNED US A 030 DEG HDG AND 5000 FT. ONCE PASSING THE COASTLINE WE WERE HANDED OFF TO THE FINAL SOCAL CTLR. WE SWITCHED TO THE FINAL CTLR AND CHKED IN. HE INSTRUCTED US TO FLY 020 DEGS; MAINTAIN 3000 FT; AND EXPECT A VISUAL APCH IN 4 MI. I READ BACK FLY 020 DEGS; MAINTAIN 3000 FT. WHEN WE WERE DSNDING OUT OF 4300 FT ON DOWNWIND; ABEAM THE ARPT; THE CTLR ASKED; WHAT IS YOUR ALT? I TOLD HIM WE WERE OUT OF 4200 FT FOR 3000 FT. HE ASKED WHO GAVE US 3000 FT? I SAID YOU DID. HE SAID HE DID NOT GIVE US 3000 FT. THE CAPT RESPONDED ON THE RADIO SAYING; ON OUR INITIAL CONTACT YOU GAVE US A 020 DEG HDG AND 3000 FT. HE SAID AGAIN THAT HE DID NOT. THE CTLR THEN CLRED US FOR A VISUAL APCH AND TO CONTACT THE TWR. AFTER ARRIVING AT THE GATE THE CAPT PROCEEDED INTO OPS TO MAKE A PHONE CALL TO SOCAL. HE TALKED TO A SUPVR WHO AGREED TO PULL THE TAPES IN A COUPLE OF HRS AND ADVISED US TO CALL BACK. WE WENT TO THE HOTEL AND CALLED BACK. THIS TIME THE CAPT WAS TALKING TO AN AREA MGR WHO ADMITTED THE CTLR HAD MADE AN OPDEV. WE WERE TOLD THAT THERE WAS NO LOSS OF SEPARATION AND THAT THE CTLR HAD INDEED CLRED US TO A 020 DEG HDG AND 3000 FT. SUPPLEMENTAL INFO FROM ACN 322430: THE FINAL CTLR SHOULD NOT HAVE ASSIGNED US THAT ALT; THE MGR SAID; BECAUSE IT WAS NOT HIS AIRSPACE. THE FINAL CTLR WOULD PROBABLY GET AN OPDEV CHARGED TO HIM. NO LOSS OF SEPARATION OCCURRED.