endnu et cursor issue jeg ikke forstår

Jeg har denne sp, den skulle gerne kunne beregne rente beløbet via min egen function, men den fejler når jeg kalder den med

Msg 512, Level 16, State 1, Procedure tilskriv_rente, Line 24
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Msg 512, Level 16, State 1, Procedure tilskriv_rente, Line 24
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Msg 512, Level 16, State 1, Procedure tilskriv_rente, Line 24
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Msg 512, Level 16, State 1, Procedure tilskriv_rente, Line 24
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.





koden her, skulle gerne loope gennem de selctede rows og berenge renten og skrive den ud via print.

ALTER PROCEDURE [dbo].[tilskriv_rente]


AS
BEGIN
    declare @renteBelob float
    declare @kontonr smallint
   
   
    declare pegefinger CURSOR for
    select kontonr from renteOpgorelse
    open pegefinger
    FETCH NEXT FROM pegefinger into  @kontonr
   
    WHILE @@FETCH_STATUS = 0 BEGIN
   
        set @renteBelob = (select  dbo.Beregn_rente(renteSaldo,dage,renteSats)
        from renteOpgorelse
        where kontonr = @kontonr)   
          /* her vil jeg indsætte rente belobet på konto's */       

        print cast(@renteBelob as varchar(20))
 
       
        FETCH NEXT FROM pegefinger into @kontonr
    END --WHILE
    close pegefinger
    deallocate pegefinger

END


GO