Insertion transaction- rollback SQL - sql-server

Question

I am new to databases and i try to create a stored procedure that inserts data in tables that are in a many to many relation.If any part of the operation fails then it must try to recover as much as possible from the entire operation. For example, if one wants to create a record regarding publishers and books and succeeds creating the publisher but fails with the book, then it should roll back
the creation of the book, but not of the publisher.
My code looks like this:
BEGIN TRY
BEGIN TRANSACTION
DECLARE #serviciuKey int
DECLARE #specializareKey int
IF NOT EXISTS (SELECT denumire, moneda, pret FROM Serviciu where denumire=#denumire and moneda=#moneda and pret=#pret)
BEGIN
INSERT INTO Serviciu ( denumire, moneda, pret)
VALUES (#denumire, #moneda, #pret)
END
SET #serviciuKey=##IDENTITY
SAVE TRANSACTION savepoint
IF NOT EXISTS (SELECT denumire, descriere FROM Specializare where denumire=#denumire_spec AND descriere=#descriere)
BEGIN
INSERT INTO Specializare( denumire, descriere)
VALUES (#denumire_spec, #descriere)
END
SET #specializareKey=##IDENTITY
SAVE TRANSACTION savepoint
IF NOT EXISTS (SELECT * FROM Specializare_Serviciu where cod_specializare=#specializareKey and cod_serviciu=#serviciuKey)
BEGIN
INSERT INTO Specializare_Serviciu( cod_specializare, cod_serviciu)
VALUES (#specializareKey, #serviciuKey)
END
SAVE TRANSACTION savepoint
COMMIT TRANSACTION
END TRY
BEGIN CATCH
IF ##trancount > 0 ROLLBACK TRANSACTION savepoint
DECLARE #msg nvarchar(2048) = error_message()
RAISERROR (#msg, 16, 1)
RETURN 55555
END CATCH
When i execute the procedure, i have this error:
Msg 3931, Level 16, State 1, Procedure AddData0, Line 76
The current transaction cannot be committed and cannot be rolled back to a savepoint. Roll back the entire transaction.
Also when i try to insert some data that already exists, it is inserted with another ID, which means that IF NOT EXIST statement is not working.
Any help, please?

Answer 1

Try this version:
DECLARE #serviciuKey int
DECLARE #specializareKey int
BEGIN TRY
BEGIN TRAN
IF NOT EXISTS (SELECT denumire, moneda, pret FROM Serviciu where denumire=#denumire and moneda=#moneda and pret=#pret)
BEGIN
INSERT INTO Serviciu ( denumire, moneda, pret)
VALUES (#denumire, #moneda, #pret)
END
SET #serviciuKey=scope_identity()
IF NOT EXISTS (SELECT denumire, descriere FROM Specializare where denumire=#denumire_spec AND descriere=#descriere)
BEGIN
INSERT INTO Specializare( denumire, descriere)
VALUES (#denumire_spec, #descriere)
END
SET #specializareKey=scope_identity()
IF NOT EXISTS (SELECT * FROM Specializare_Serviciu where cod_specializare=#specializareKey and cod_serviciu=#serviciuKey)
BEGIN
INSERT INTO Specializare_Serviciu( cod_specializare, cod_serviciu)
VALUES (#specializareKey, #serviciuKey)
END
COMMIT TRAN
END TRY
BEGIN CATCH
IF ##trancount > 0
ROLLBACK TRAN
DECLARE #msg nvarchar(2048) = error_message()
RAISERROR (#msg, 16, 1)
RETURN 55555
END CATCH