Is this a point-to-point bridge scenario? Your root bridge should be set to:
station-role root bridge
And your non-root should be set to:
station-role non-root bridge
If your 1100 is in root access point mode (station-role root), your 1242 can operate as a workgroup bridge and associate to the 1100 as a client. To do that, use:
station-role workgroup-bridge