Ok making the changes on build.prop stops the update notice.
Code:ro.build.display.id=JRO03R.A2109A_A411_03_13_121126 ro.build.version.incremental=A2109A_A411_03_13_121126
So if you want to use custom rom replace
ro.build.display.id=JRO03R.A2109A_03_13_121126_MCL0201
ro.build.version.incremental=MCL0201
with
Code:ro.build.display.id=JRO03R.A2109A_A411_03_13_121126 ro.build.version.incremental=A2109A_A411_03_13_121126
then use adb
adb shell
rm -r /cache/*
rm -r /data/dalvik-cache/*
reboot
on reboot check for updates says system is currently up to date.
even though I am still running custom rom, so best if devs don't modify build.prop
I don't recommend doing that (unless you just want to check to see if there are updates). If Lenovo releases a patch-type update (as most of the ICS updates were), it won't apply over a custom ROM.