ACR X CLB THROUGH OCCUPIED ALT HAD LTSS FROM ACFT Y. SYS ERROR.

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THE OASIS DEP AT LAS HAS A XING RESTR OF 7000 FT AT LAS211007; THEN CLB TO ASSIGNED ALT. WHEN ACFT INITIALLY CONTACT DEP; THEY NORMALLY RPT ALT LEAVING AND ASSIGNED ALT; E.G.; 'LAS VEGAS DEP; X IS WITH YOU; LEAVING 3500 FT FOR 15000 FT.' RECENTLY I'VE NOTICED MORE ACFT GIVING THE XING RESTR AS THEIR ASSIGNED ALT; EVEN THOUGH THEY INTEND TO CLB AFTER MEETING THE RESTR. WHEN THIS FIRST OCCURRED; ACR X CALLED LEAVING 3000 FT FOR 7000 FT. I HAD ENRTE TFC OPPOSITE DIRECTION AT 9500 FT; AND SAME DIRECTION ACFT Y AT 8500 FT; SO I ISSUED NO HIGHER ALT. 10 MI S OF THE FIELD; I NOTICED THE DEPARTING PLT WAS LEAVING 8000 FT; SO I ISSUED TFC AND ASKED THE PLT WHAT HE WAS DOING; TO WHICH HE REPLIED 'CLBING TO 17000 FT.' WHEN ASKED ABOUT HIS RPTED CLB TO 7000 FT; HE INDICATED THAT AT THE TIME THAT WAS HIS ASSIGNED ALT; UNTIL MEETING THE RESTR. IT APPEARS THAT THE PLT WANTED TO MAKE ME AWARE OF SOMETHING THAT I ALREADY KNEW; HIS RESTR OF 7000 FT AT 7 DME. I'M WELL AWARE OF THIS RESTR AND FRANKLY DON'T NEED EVERY DEP TO REMIND ME THAT HE WOULD LIKE THE RESTR LIFTED; WHICH IS HIS REAL INTENT IN STATING SAME. I'M NOT ABLE TO FIND A REQUIREMENT THAT PLTS RPT ASSIGNED ALT OR ALT CLBING TO; BUT IF THEY ARE GOING TO SAY ALT CLBING TO OR ASSIGNED; THEY SHOULD RPT IT CORRECTLY. SINCE THIS FIRST INCIDENT; WHENEVER A PLT RPTS CLBING TO 7000 FT; I ASK HIM TO VERIFY ASSIGNED ALT AND MANY TIMES HAVE BEEN ADVISED THAT THE PLT FULLY INTENDED TO CLB ABOVE HIS RPTED 7000 FT TO HIS ACTUAL ASSIGNED ALT.