SMT Y HAD LTSS FROM ACR X. SYS ERROR. SMT Y IMPROPER REQUEST FOR IFR CLRNC FAILED TO STATE ARPT OF DEP WHEN REQUESTING CLRNC TO OTP. PLTDEV.

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I WAS WORKING SBN RADAR COMBINED R3/R4; VECTORING ACR X; INBOUND TO SBN FOR THE ILS 27 APCH. ACR X WAS 8 E AT 2500 FT. ISSUED HDG 180 FOR A VECTOR TO THE FINAL APCH COURSE. ACR X APPROX 3.5 N OF LOC. I THEN NOTICED A NON ARTS ACQUIRED TARGET DEPART EKM; WHICH IS 14 MI E OF SBN ARPT. THE TARGET WAS WBOUND OBSERVED CLBING THROUGH 1600 FT WHEN THE ARTS ACQUIRED THE DATA BLOCK ON THE TARGET INDICATING THE TARGET TO BE IFR. TAG SMT Y OBSERVED THROUGH 2000 FT WBOUND. I ASKED EKM TWR IF THEY HAD DEPARTED ANY VFR TFC; '...AFFIRMATIVE...SMT Y WBOUND AND WILL CALL YOU....' SMT Y DEPARTED EKM WITH AN IFR CLRNC TO VFR OTP. FD AT SBN ISSUED THE CLRNC TO SMT Y THINKING THE ACFT WAS DEPARTING SBN ARPT. EKM NEVER KNEW SMT Y WAS IFR. EKM WX WAS VFR AT THE TIME; WHEN THEY DEPARTED SMT Y. ACR X AND SMT Y IN IFR WX PASSED WITH 1/2 MI OF EACH OTHER. ACR X AND SMT Y WERE ISSUED HDGS TO AVOID EACH OTHER. LATER; ACR X RPTED HE DID HAVE THE TARGET ON TCASII AND NO OTHER COMMENT MADE BY ACR X; NOR ANY BY SMT Y. ACR X LANDED AT SBN WITH NO OTHER COMMENT. SMT Y LEFT THE APCH CTL AREA WITH NO COMMENT.