Updating entries in a ztable

Question

Hi,
I have a database table with the following structure: -
MANDT: -        PK (Primary Key)
PLANT: -         PK
MATNR: -        PK
VALID TO: -     PK
VALID_FROM
The table contains a record such as the following: -
400    3330    material1    31/12/9999    28/06/2008
What I am trying to do programmatically is to replace the above record with the following 2 records (CONTAINED IN AN INTERNAL TABLE PT_PRICE_LEVEL): -
400    3330    material1    28/06/2008    28/06/2008
400    3330    material1    31/12/9999    29/06/2008
In order to achieve this, I created a function module and called it in update mode. The function module has the following code in it: -
      DELETE FROM table_name
        WHERE plant = 3330
          AND matnr = 'material1'
          AND valid_to = '31/12/9999'. (This deletes the existing record)
      INSERT zptp_rcd_pricelv FROM TABLE pt_price_level. (This inserts the new records).
This should have worked but instead it generates an error message saying that duplicate records can't be inserted.
I think I know the reason. I think I need to call a commit after the delete operation and then insert the new records. But, this code is in an update FM. I don't think I am allowed to call the COMMIT statement within an update FM. Can anyone provide me with suggestions on how an existing records primary key can be updated? My approach certainly doesn't seem to work.
Any help would be appreciated.
Regards,
Divyaman

Answer 1

Hi,
Thank you all for your suggestions. But, the real cause of the problem is as follows: -
The primary key had been specified on the following four keys: -
MANDT: - PK (Primary Key)
PLANT: - PK
MATNR: - PK
VALID_TO: - PK
However, a unique index had also been created (something which I wasn't aware of) which included only the first 3 fields. As a consequence, when I entered 2 rows with the same combination of mandt, plant and matnr but a different valud for valid_to, I was getting an error message stating that duplicate records can't be inserted.
Regards,
Divyaman