>I see that the wheretype is set to 3 (Key and modified fields). May be the update conflict is there. Did the client can update that view in under other conditions? If yes, maybe you should set it to 1 (key fields only). If not, the problem may be directly in the table. Does the PK in the table has a filter !Deleted() if same key?

Can you tell me what wheretype parameter means?

No, there is no update done externally.

We do not use a filter for not deleted(). We are running with SET DELETE ON and have a tag on DELETED().