Prvent from the user deleting specific line in view table

HI,
In our Project we have a View Table which user can maintain ,
the user can change or delete the line (and fields) in this table.
what i want is for one line for specific combination in the table to prevent from the user to delete this line ,
so when he push on change mode and mark the line and push on delete i want to give him a error message that he can't delete this line (because the specific combination ).
i new for the concept of the PBO PAI....
so i appreciate any help or suggestions.
Best regards
Micheal A

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