Siebel developers who have configured at least one ‘decent’ associate applet would have seen this dreaded error.
No association list is available in this applet. (SBL-DAT-00276).
This is dreaded not because it is difficult to solve, but since it has the ability to provide sleepless night while developers debug on what went wrong.
The root cause for the above error is simple - the underlying parent BC would have become read-only for whatever reason. Instead of showing a user-friendly error, Siebel will show a cryptic message and show you who’s in charge.
Fix the error by debugging the conditions under which the parent becomes read-only and working around that. Or, you could use Admin Mode to override user properties.