Hi Naani,
I do not think it is possible what you want to achieve here.
As I understand you want to enable HKONT i.e. GL Account for 0FI_GL_4 datasource - this is not possible for below reason:
0FI_GL_4 datasource works based on two main tables BKPF and BSEG. Logically the first selection is made on BKPF table which is header table and then for all the selected records subsequent selection is done on BSEG table internally. So ideally any selection you pass to datasource is only limited to table BKPF.
Now BKPF table don't have the GL Account field so you won't be able to enable this field and even if you somehow do that it will not have any impact on dataselection and you will not get desired data.
An excerpt from datasource code:
So from below we know that select statement on BSEG table do not consider HKONT at all and hence it will never be considered even if we pass it forcefully to datasource selection.
So my suggestion -
Agreed to Ram's alternative solution, extract all data in PSA and then manipulate it further in BW. This datasource is Delta so you will not get FULL data always.
Please let me know if there are any questions.
Thanks
Amit