I know because I have had this recently.
The solutions say.....
This is likely a version incompatibility, between database and application software. The database may be at a higher, or more recent version than the application software.
You can do this when looking in Version Info on the site. Then compare the build version of the POS tab and the Database Tab.
Also look in the 3700dlog and see which table is causing the error because it may have reached it's mass Constraint. Then you can search solutions by that table for the next step.
IF the Second >>>>
This does require DBA.
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Go into Sybase Central, locate table notify_event_temp
Go to Check Constraints tab
Right-click properties on the constraint for notification_seq
Defitions tab
Adjust the upper bound of that constraint to be 2147483647 instead of 9999999
Save, reload db, restart dbupdate