Problems with update/insert and the ON clause

I have two rather identical mappings, both supporting SCD Type II. One of them works, the other one doesn't.
As in the SCD whitepaper, I have a split, that ultimately ends in a union, and then UPDATE/INSERTs into the target dimension. My problem is, that though using the matching_id for matching in one mapping, it is not allowed in the second mapping. The error is ORA-38104: The columns refererred in the ON-Clause cannot be updated "MyTable.MyId" (all loosely translated).
I just don't understand it, as it should be able to match the ID, and if not found, create a new record using INSERT.
I found a description of the error that sounded like this (https://cwisdb.cc.kuleuven.ac.be/ora10doc/server.101/b10744/e38001.htm):
ORA-38104: Columns referenced in the ON Clause cannot be updated: string
Cause: LHS of UPDATE SET contains the columns referenced in the ON Clause
Action: none
I just don't understand how this can be a problem, since I have to carry the surrogate key along, in order to assure that the proper records gets updated...
Anyone who can enlighten me on this one?
Regards
Kim

Oh yes :) I was a quite active participant. What puzzles me is, that I cannot get mapping #2 to work. I have tried to do everything virtually alike, with regards to the surrogate key, and the extra mapping column.
My setting for the keys are as below:
Surrogate Matching
Load column when inserting: yes no
Load column when updating: yes no
Match column when updating: no yes
Load column when deleting: no no
Table best viewed in notepad :)
It "feels" like it's trying to update the surrogate key, instead of actually matching.
Regards
Kim

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