How can we put a tick in the BADI (HRECM00_CALCBASE ) for Multiple use

Dear Freinds,

I want to put a tick for Multiple use in the BADI HRECM00_CALCBASE.

if we check from se 18 > HRECM00_CALCBASE >

i tried to put a tick in the check box of Multiple use in the attributes of the BADI .

HRECM00_CALCBASE

iam able to edit in se18 however it is not allowing me to save after putting a tick in the check box and iam getting the below error.

Interface HRECM00_CALCBASE invalid for business add-in definition IF_EX_HRECM00_CALCBASE (cannot be saved)

Message no. ENHANCEMENT181

could any one let me know how to make multiple use checked ..

regards

syamla