DSO self transformation

Hi,

I have one DSO which contains some data. My requirement is to replace GL Account = X with 'Y'.

This DSO has 6 other key fields.

I am trying use the following code in start routine. However the below code is not changing the existing record , but it is creating a new record by copying the existing record, and replacing the GL account = Y.

In the end, i have two records, one with GL =X and another with GL = Y.

I just need only one record with GL = Y.

LOOP AT SOURCE_PACKAGE ASSIGNING <SOURCE_FIELDS>.

IF <SOURCE_FIELDS>-GL_ACCOUNT = 'X'

<SOURCE_FIELDS>-GL_ACCOUNT = 'Y'.

ENDIF.

ENDLOOP.