Insert where not exists Violation of PRIMARY KEY - sql

Question

I'm having troubles with an Insert where not exists and I'm not sure if a MERGE statement would be more efficient or what's wrong with my statement.
I have en existing View and need to insert the new records of this View into a Table.
The Table looks like:
CREATE TABLE [dbo].[ser_number_all]
(Serialnumber nvarchar(100) PRIMARY KEY,
TypeName nvarchar(max),
Date datetime,
Parent_Serialnumber nvarchar(100),
JobNumber nvarchar(30),
ProductNode hierarchyid,
);
The Insert statement looks like this:
insert into [dbo].[ser_number_all]
( Serialnumber
, TypeName
, Date
, Parent_Serialnumber
, JobNumber
, ProductNode)
select Serialnumber
, TypeName
, Date
, Parent_Serialnumber
, JobNumber
, ProductNode
from dbo.Hierachical_View_with_Jobnumbers as ser_number_all
where not exists (select 1
from Hierachical_View_with_Jobnumbers as hv
where hv. Serialnumber = ser_number_all.Serialnumber
and hv. TypeName = ser_number_all.TypeName
and hv. Date = ser_number_all.Date
and hv. Parent_Serialnumber = ser_number_all.Parent_Serialnumber
and hv. JobNumber = ser_number_all.JobNumber
and hv. ProductNode = ser_number_all.ProductNode);
As long the View has not any new records, it looks ok and I'm not getting any error, the output is 0 records as it should be.
When I add a new record to the origin table and the view has 1 record more, I'm always getting this error:
Msg 2627, Level 14, State 1, Line 4
Violation of PRIMARY KEY constraint 'PK__ser_numb__F2753A12C4ABA976'. Cannot insert duplicate key in object 'dbo.ser_number_all'. The duplicate key value is (.x3666AB05).
The statement has been terminated.
I don't get it why it will insert a duplicate value in the primary key column because in my WHERE clause I can't see any mistake.
I have also tried with IS NULL instead = ser_number_all.TypeName and for all other columns where it could have a NULL value, but still the same.
Again, I'm coming from Oracle and it looks like I have to learn many diversities with MS SQL compared to Oracle.
Appreciate any suggestion :-)
Thx
EDIT:
Here the code of the View:
CREATE VIEW [dbo].[Hierachical_View_with_Jobnumbers]
AS
WITH ProductList
AS
(
SELECT p.Serialnumber,
p.Type_Id,
p.Parent_Serialnumber,
p.ActiveJob_Jobnumber as JobNumber,
N'/' + CONVERT(NVARCHAR(4000), ROW_NUMBER() OVER (ORDER BY p.Serialnumber)) + N'/' AS ProductNode_AsChar
FROM Products AS p
WHERE p.Parent_Serialnumber IS NULL
UNION ALL
SELECT p.Serialnumber,
p.Type_Id,
p.Parent_Serialnumber,
JobNumber,
pl.ProductNode_AsChar + CONVERT(NVARCHAR(4000), ROW_NUMBER() OVER (ORDER BY p.Serialnumber)) + N'/'
FROM Products AS p
INNER JOIN ProductList AS pl ON p.Parent_Serialnumber = pl.Serialnumber
)
SELECT Serialnumber,
pt.Name as TypeName,
Parent_Serialnumber,
JobNumber,
CONVERT(HIERARCHYID, ProductNode_AsChar) AS ProductNode
FROM ProductList as pl
INNER JOIN ProductTypes as pt on pl.Type_Id = pt.Id;

Answer 1

#TheGameiswar
Sorry, now I got it what you meant ;-) Stupid me...
Here the solution which works now with correctly correlating:
insert into [dbo].[ser_number_all]
( Serialnumber
, TypeName
, Date
, Parent_Serialnumber
, JobNumber
, ProductNode)
select Serialnumber
, TypeName
, Date
, Parent_Serialnumber
, JobNumber
, ProductNode
from dbo.Hierachical_View_with_Jobnumbers as hv
where not exists (select 1
from ser_number_all as sna
where hv. Serialnumber = sna.Serialnumber);
Thank you all for your time and guiding me to the right direction :-)