Standard FICA datasoources ate missing- Alternative solution

Question

Hi All,
Our ISU system is in ECC6 with out any Ehp. CRM-2005 is connected with ISU system through middleware.
We are missing standard FICA BW datasources( 0FC_BP_ITEMS,0FC_DUN_HEADER,0FC_DUN_ITEMS) due to unavalability of Ehp in the ISU system.
If Ehp will be apply to ISU system, CRM system need to be upgraded to CRM7 which is not feasible in current time.
As per BW implementation we need to use these extractors which are based on important FICA tables.As the base table for these extractors will have huge volume of data(Utilities Industry).
Request you to help us the alternative solution for this without upgrading any Ehp in the ISU system. If we will create custom extractors performance issue may come.
I have refered the Blogs where performance issue is mentioned for custom extractor.
Regards,
Asish

Answer 1

You listed two of the best options possible...
1) Upgrade ECC to EHP2 and CRM to CRM 7.0.
2) Create generic DataSources from the source tables.
The only other option you would have is to create a remote-enabled FM in your source ECC environment to extract data out of the source table(s) and insert into an ITAB, create an ABAP program in your BW environment that calls the remote-enabled FM and receives the extracted data ITAB and then load that data into a custom table in BW. Then create a generic DataSource on that custom table in BW. Realize, this would pretty much be the same as creating a generic DataSource on the ECC environment, but would be more easily replaced when you do eventually update and potentailly move to the standard content DataSources.