SAP CRM data source --XIF

Hi All,

I'm planning to enhance data source"OCRM_SRV_CONTRACT_H" with table "CRMD_CUSTOMER_H.

I do want want to use BADI coz it will read table "CRMD_CUSTOMER_H nd again and again will impact the  performance.

So want to implement this by using FM "CRM_BADI_GET_XIF" so tht data can be read from memory rather thn hitting the table data.

I'hv gone thru this FM but was not really sure how to use this.....

Please can anyone suggest the steps  to do it..

Thanks,

Rohith