Okay, What kind of digital output is on the Boss, lightpipe or RCA? If its RCA, change the Optical Format(in Setup>Hardware) to ADAT, which should(might) allow the RCA SPDIF to work(shooting in the dark since I don't know how things are connected). Assuming the 002 is fully working(not a sure thing due to the old "power harness" issue), the biggest reason I know for clock source defaulting back to Internal is because the connection sees no clock. Reasons for this:
1-Roland is not outputting signal on its digital output(is there a setting in the Roland that needs to change?)
2-the cable is bad or not seated(the plastic optical connectors are pretty crappy)
3-the signal from the Roland is at a different sample rate than the session.
Hope something here helps. I clocked my 002 via ADAT(lightpipe) for years with several 8-channel outboard preamps(Presonus D8, Firestudio and Focusrite ISA-428 with digital option card)
