Hi Mohan,
What is the Data Type for the ls_r_custname? it should be
ranges: ls_r_custname for ekko-verkf.
After that populate the customer no in ls_r_custname variable as ls_r_custname-low.
try to use ls_r_custname-option = 'CS' if 'EQ' is not working.
And also check, EKKO field VERKF contains any informaiton or not.
reagrds.
Praveer.