I am seeing so many lines in Domino console as the following:
[0D90:004E-21A4] 15/02/2024 09:14:58 [C&S Error] 50ACB4D45050FB6FC1258ABA004FA322 Release 12.0.2FP2 csinvoke.cpp (CCSEventDesc::InvokeInit) : (0x3C8): Invalid or nonexistent parent document
[0D90:004E-21A4] 15/02/2024 09:14:58 [C&S Error] FC3B218952418073C1258ABA004F9D0A Release 12.0.2FP2 csinvoke.cpp (CCSEventDesc::InvokeInit) : (0x3C8): Invalid or nonexistent parent document
[0D90:004E-21A4] 15/02/2024 09:14:58 [C&S Error] F49338E22596A223C1258AB700358766 Release 12.0.2FP2 csinvoke.cpp (CCSEventDesc::InvokeInit) : (0x3C8): Invalid or nonexistent parent document
[0D90:004E-21A4] 15/02/2024 09:14:58,98 [C&S]> ERROR | Release 12.0.2FP2 | csinit.cpp(1623) : Invalid or nonexistent parent document (0x3C8)
[0D90:004E-21A4] 15/02/2024 09:14:58,98 [C&S]> ERROR | Release 12.0.2FP2 | csinit.cpp(980) : Invalid or nonexistent parent document (0x3C8)
[0D90:004E-21A4] 15/02/2024 09:14:58,98 [C&S]> ERROR | Release 12.0.2FP2 | csinit.cpp(417) : Invalid or nonexistent parent document (0x3C8)
[0D90:004E-21A4] 15/02/2024 09:14:58,98 [C&S]> ERROR | Release 12.0.2FP2 | csinit.cpp(477) : Invalid or nonexistent parent document (0x3C8)
[0D90:004E-21A4] 15/02/2024 09:14:58,98 [C&S]> ERROR | Release 12.0.2FP2 | csinvoke.cpp(CCSEventDesc::InvokeInit) : Invalid or nonexistent parent document (0x3C8)
[0D90:004E-21A4] 15/02/2024 09:14:59 [C&S Error] 5A54191E362DE7FBC1258AB700351DC9 Release 12.0.2FP2 csinvoke.cpp (CCSEventDesc::InvokeInit) : (0x3C8): Invalid or nonexistent parent document
On this server is running the following: Replica,Router,Update,AMgr,Adminp,Sched,CalConn,RnRMgr,TRAVELER, ca, ldap, certmgr, collect, nomad
I can't find anything about it, and even ChatGPT is very generic about it :-)
These are typically calendar messages (C&S) that either come from sched, calconn or rnrmgr. Unfortunately the UNID does not give you a hint about the database where this error occurs.
It is possible, that this has something to do with responses to invitations as well, then you would find a message in routing logs and maybe find the reason for this messages.
If you cannot identify the database from "surrounding" logs you could either try "tell sched validate USERNAME" for several users and find out if any of these can be associated with the message.
If this is not successful then you could try to "brute force find" the documents by creating an agent that searches through all mailfiles for the UNIDs.
That would be like: