Hello André,
your question is what can cause that the modeled CI in the Service itself is deleted instead only the CI from the Connector in the SAMStore Database ? Is this correct ?
This can happen when the connector is removed from SOI or a single CI is deleted in the MDR for such CIs that have only one projection.
You may open the USM Notebook for the CI in SOI and verify if there is only one projection from the Spectrum Connector. When there is a second projection for the same CI, the modeled CI in the Service will not be deleted.
A second projection will be created when you use the WSSSAServicecmd to create a full backup xml file of all Services with their modeled CIs.