How to merge key field from external source system with SAP R/3 master

Hi,
In SAP BW 7.0 system, our scenario is Master Data for 0GL_ACCOUNT is coming from SAP R/3 alongwith the Transactional data records for standard FI cubes. Then, one more set of transaction data is coming from external source system, a flat file, into another custom DSO(ZDSO_FI), which also has this GL Account field.
This flat file's GL account, GL_file, has to be basically mapped/merged with the standard 0GL_ACCOUNT field so that at the time of loading the transactional data for custom DSO, ZDSO_FI (with transformation mapping GL_file > 0GL_ACCOUNT), system automatically refers to the 0GL_ACCOUNT master data to load these incoming transactional values, from the external flat file system. How can this be done?
To illustrate the scenario, say I have 5 records in 0GL_ACCOUNT, loaded from SAP R/3 into SAP BW-
0GL_ACCOUNT      Short Description     Source System
100                                   D1                          R/3
200                                   D2                          R/3
300                                   D3                          R/3
400                                   D4                          R/3
500                                   D5                          R/3
Now suppose if my flat file has following sample transactional data, to be uploaded in SAP BW ZDSO_FI-
GL_file      Key Figure1
400          789
200          567
Then after uploading this transactional data in ZDSO_FI (with transformation mapping GL_file > 0GL_ACCOUNT), the 0GL_ACCOUNT data becomes as below-
0GL_ACCOUNT      Short Description     Source System
400
200
100                                   D1                          R/3
200                                   D2                          R/3
300                                   D3                          R/3
400                                   D4                          R/3
500                                   D5                          R/3
So note that the system did not refer the incoming GL's from flat file, although the field is mapped to 0GL_ACCOUNT in transformation, to the already available master data. Rather created 2 new data rows for the GL accounts coming from external system. Because of this I am not able to perform the calculations common from standard FI cube and ZDSO_FI, with GL account as key field. I need to synchronise these data values based on GL Account to proceed with further calculation and am badly stuck.
Request if anyone can please throw some light on how to achieve this seemingly simple requirement?
Thanks in advance.
Nirmit

Better post this thread is in the [Enterprise Data Warehousing|Data Warehousing; forum.

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