AN ACR PILOT REPORTS ORD TRACON REQUIRING ACFT CROSS WAVIE INTXN ON THE RWY 28 ILS/LOC AT 5000 FT TO PREVENT CONFLICT WITH ACFT ON APCH TO 27 AT 4000 FT.

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THE CREW OPERATED THE ACFT AS DICTATED IN THE COMPANY'S PUBLISHED PROCS AND CONSISTENT WITH THE PAST PRACTICE OF OPERATING IN THE ORD APCH ENVIRONMENT. THE PRACTICE OF JOINING THE GS FROM ABOVE CERTAINLY IS CONSISTENT WITH THE PUBLISHED OPERATING RULES BUT FOR THE LAST 21 YRS WE HAVE BEEN JOINING THE GS UPON INTERCEPT AT ORD AND THAT IS WHAT I THOUGHT THEY EXPECTED. ORD ATC WAS IN A W FLOW USING SIMULTANEOUS ARRS TO RWYS 27R AND 28. THE FLT WAS CLRED FOR THE APCH MAINTAIN 5000 FT TO WAVIE. THE FLT GUIDANCE CTLR WAS ARMED FOR THE APCH MODE AS THE ACFT WAS ESTABLISHED INBOUND. WHEN THE GS CAPTURED THE ACFT DEPARTED 5000 FT AND FOLLOWED THE GS BEAM. THE APCH WAS COMPLETED NORMALLY. AFTER LNDG THE ORD TWR REQUESTED THAT I CALL THE APCH CTL IN ELGIN. I SPOKE WITH A SUPVR WHO ADVISED ME THAT THEY SHOWED THE ACFT TO BE 300 FT LOW OVER WAVIE. HE INDICATED THAT THERE WAS NO LOSS OF SEPARATION BUT THAT THEY HAD SHOWN AN ALTDEV. HE ALSO INDICATED THAT IT IS THE INTENTION OF ORD ATC THAT WE JOIN THE GS FROM ABOVE AFTER WAVIE. HE INDICATED THAT THIS WAS AN INTENTIONAL CHANGE REQUESTED BY ORD ATC WHEN THE NEW RWY 28 ILS PROC WAS DESIGNED. HE ALSO INDICATED THAT THIS WAS A RECURRING PROB WITH MULTIPLE AIRLINES AND PLEASE ADVISE THE PLTS OF WHAT ORD ATC INTENDED AND WAS EXPECTING. FAILURE TO MAINTAIN 5000 FT TILL PAST WAVIE AND ABOVE THE GS COULD RESULT IN A LOSS OF SEPARATION. REQUEST FROM THE ORD TWR TO CALL THE APCH CTL FACILITY. I MUST SAY THE FACILITY WAS VERY PROFESSIONAL AND INDICATED THAT THEY ONLY WANTED TO SEE A CHANGE IN HOW WE OPERATED ON THE ILS RWY 28. 1) SPOKE WITH AN ATC SUPVR AS REQUESTED BY THE TWR. 2) NOTIFIED MY DOMICILE CHIEF PLT OF THE ORD FACILITY'S DESIRE FOR TO JOIN THE APCH FROM ABOVE NOT ON GS INTERCEPT. 3) COMPLETED A RPT TO ENSURE THE FACILITY'S CONCERN IS AVAILABLE FOR DISSEMINATION. 4) CONSIDER REVIEW OF THE APPROPRIATE TIME TO SELECT APCH MODE ON THE FLT GUIDANCE CTLR WHEN CLRED FOR AN APCH IN THE AOM 1 PROCS. CONSIDER IF THE GEOGRAPHIC LOCATION OF WAVIE AT A POS ABOVE THE GS BEAM IS THE BEST LOCATION.